Data processing apparatus and method

ABSTRACT

The disclosure provides a data processing device and method. The data processing device may include: a task configuration information storage unit and a task queue configuration unit. The task configuration information storage unit is configured to store configuration information of tasks. The task queue configuration unit is configured to configure a task queue according to the configuration information stored in the task configuration information storage unit. According to the disclosure, a task queue may be configured according to the configuration information.

TECHNICAL FIELD

The disclosure relates to a data processing device and method.

BACKGROUND

On a conventional processor chip, a central processing unit (CPU) transmits a launching configuration instruction to an instruction memory of a dedicated processor core to launch the dedicated processor core to complete a task, and the whole task continues to be executed until an end instruction is executed. Such a task launching manner is called common launching. However, such a common launching mode has the following problems. It is difficult to dynamically monitor an execution state of a present task and to schedule the present task.

SUMMARY Technical Problems to be Solved

In view of this, the disclosure aims to provide a data processing device and method, which may realize functions of task queue configuration and scheduling and the like to solve the above-mentioned problems.

Technical Solutions

In a first aspect of the disclosure, a data processing device is provided, which may include a task configuration information storage unit and a task queue configuration unit. The task configuration information storage unit is configured to store configuration information of tasks. The task queue configuration unit is configured to configure a task queue according to the configuration information stored in the task configuration information storage unit.

In some examples, the task configuration information storage unit may include multiple storage units configured to store multiple task queues into each storage unit according to the configuration information.

In some examples, the configuration information may include start tags of the tasks, and/or end tags of the tasks, and/or priorities of the tasks, and/or launching manners for the task.

In some examples, the multiple storage units include a first storage unit and a second storage unit. The first storage unit is configured to store a first task queue. The second storage unit is configured to store a second task queue.

In some examples, the first task queue may include a high-priority task queue, and the second task queue may include a low-priority task queue.

In some examples, the data processing device may further include an external device configured to provide the configuration information and execute a task queue.

In some examples, the external device is configured to send the configuration information to the task configuration information storage unit.

In some examples, the task queue configuration unit is configured to send a configured task queue to the external device, and the external device is configured to execute tasks in the task queue and to send a first end signal to the task configuration information storage unit every time a task is executed. The task configuration information storage unit is configured to send an interrupt signal to the external device every time a first end signal is received, and the external device is configured to process the interrupt signal and to send a second end signal to the task configuration information storage unit.

In some examples, the task configuration information storage unit is configured to modify the stored configuration information of the task after receiving the first end signal.

In some examples, the external device may include one or more processor cores.

In some examples, the processor core may include a control module and an operation module. The control module is configured to provide the configuration information, and the operation module is configured to execute the task queue.

In some examples, the control module is configured to send the configuration information to the task configuration information storage unit.

In some examples, the operation module may include a control unit, an operation unit, and a storage unit. The task queue configuration unit is configured to send a configured task queue to the control unit. The control unit is configured to monitor configuration information of a self-launching task queue device, to configure an operation instruction stored in the storage unit, to control the operation unit and the storage unit to execute tasks in the task queue, and to send a first end signal to the task configuration information storage unit every time a task is executed. The task configuration information storage unit is configured to send an interrupt signal to the control unit every time a first end signal is received. The control unit is configured to process the interrupt signal and to send a second end signal to the task configuration information storage unit.

In some examples, the operation unit may include a primary processing circuit and multiple secondary processing circuits. The operation unit may include a tree module, the tree module may include a root port and multiple branch ports, the root port of the tree module is coupled with the primary processing circuit, and each of the multiple branch ports of the tree module is coupled with a secondary processing circuit of the multiple secondary processing circuits respectively. The tree module is configured to forward data blocks, weights, and operation instructions between the primary processing circuit and the multiple secondary processing circuits.

In some examples, the operation unit may include a primary processing circuit, multiple secondary processing circuits, and multiple branch processing circuits. The primary processing circuit is configured to divide tasks in the task queue into multiple data blocks and to send at least one data block of the multiple data blocks, weights, and at least one operation instruction of multiple operation instructions to multiple the branch processing circuits.

The multiple branch processing circuits are configured to forward the at least one data block, the weights, and the at least one operation instruction between the primary processing circuit and the multiple secondary processing circuits.

The multiple secondary processing circuits are configured to execute computation on the at least one data block and the weights received according to the at least one operation instruction to obtain intermediate results and to transmit the intermediate results to the multiple branch processing circuits.

The primary processing circuit is configured to perform subsequent processing on the intermediate results from the multiple branch processing circuits to obtain a result of the at least one operation instruction and to send the result of the at least one operation instruction to the control unit.

In some examples, the operation unit may include a primary processing circuit and multiple secondary processing circuits. The multiple secondary processing circuits are arranged in an array distribution; each secondary processing circuit is coupled with other adjacent secondary processing circuits; the primary processing circuit is coupled with k secondary processing circuits of the multiple secondary processing circuits; and the k secondary processing circuits include n secondary processing circuits in the first row, n secondary processing circuits in the m^(th) row, and m secondary processing circuits in the first column.

The k secondary processing circuits are configured to forward data and instructions between the primary processing circuit and the multiple secondary processing circuits.

The primary processing circuit is configured to divide a piece of input data into multiple data blocks and to send at least one data block of the multiple data blocks and at least one operation instruction of multiple operation instructions to the k secondary processing circuits.

The k secondary processing circuits are configured to convert data between the primary processing circuit and the multiple secondary processing circuits.

The multiple secondary processing circuits are configured to execute computation on the received data block according to the at least one operation instruction to obtain intermediate results and to transmit the intermediate results to the k secondary processing circuits.

The primary processing circuit is configured to perform subsequent processing on the intermediate results sent by the k secondary processing circuits to obtain a result of the at least one operation instruction and to send the result of the at least one operation instruction to the control unit.

In some examples, the primary processing circuit is configured to combine and sequence the intermediate results sent by the multiple secondary processing circuits to obtain the result of the operation instruction.

In some examples, the primary processing circuit is configured to combine, sequence, and activate the intermediate results sent by the multiple processing circuits to obtain the result of the operation instruction.

In some examples, the primary processing circuit may include at least one selected from a group consisting of a conversion processing circuit, an activation processing circuit, and an addition processing circuit.

The conversion processing circuit is configured to execute preprocessing on the data. The specific operations are as follows. Exchange between a first data structure and a second data structure is executed for data or intermediate results received by the primary processing circuit, or exchange between a first data type and a second data type is executed for data or intermediate results received by the primary processing circuit.

The activation processing circuit is configured to execute subsequent processing, which refers to executing activation computation on data in the primary processing circuit.

The addition processing circuit is configured to execute subsequent processing, which refers to executing addition computation or accumulation computation.

In some examples, the secondary processing circuit may include a multiplication processing circuit.

The multiplication processing circuit is configured to execute multiplication computation on the received data block to obtain a multiplication result.

In some examples, the secondary processing circuit may further include an accumulation processing circuit, and the accumulation processing circuit is configured to execute accumulation computation on the multiplication result to obtain an intermediate result.

In some examples, the tree module is configured as an n-ary tree structure, n being an integer greater than or equal to two.

In some examples, the storage unit may include an external storage module and an instruction storage module. The control unit is configured to configure the operation instruction in the storage unit, which may include that an instruction in the external storage module of the storage unit is input into the instruction storage module.

In some examples, the storage unit is configured to store data and instructions for neural network operation. The control unit is configured to control the storage unit and a neural network operation unit to execute the tasks in the task queue. The operation unit may include the neural network operation unit. The neural network operation unit is configured to execute neural network operation on the data according to the instructions stored in the storage unit.

In some examples, the storage unit is configured to store data and instructions for universal computation. The control unit is configured to control the storage unit and a universal operation unit to execute the tasks in the task queue. The operation unit may include the universal operation unit. The universal operation unit is configured to execute universal computation on the data according to the instructions stored in the storage unit.

In some examples, the device may further include a data cache, an instruction cache, and a direct memory access (DMA). The data cache is configured to cache data, intermediate results, and computational results. The instruction cache is configured to cache instructions. The DMA is configured as a data interface between the storage unit and the data cache or a data interface between the storage unit and the instruction cache.

In some examples, the data cache may include an input neuron cache, a weight cache, and an output neuron cache. The input neuron cache is configured to cache input neurons. The weight cache is configured to cache weights. The output neuron cache is configured to cache output neurons.

In some examples, the neural network operation unit may include at least one computational component, and the computational component may include at least one multiplier, and/or at least one adder, and/or at least one activation function unit, and/or at least one pooling unit.

In some examples, multiple adders form an adder tree.

In some examples, the neural network operation unit may include multiple processing elements (PEs), and/or one or more arithmetic logic units (ALUs).

In some examples, the PE may include a multiplier, an adder, a comparator, and a register or register set.

In some examples, the multiplier is configured to multiply first input data and second input data to obtain an output.

The disclosure further provides a chip, which may include any above-mentioned data processing device.

The disclosure further provides a chip package structure, which may include the above-mentioned chip.

The disclosure further provides a board card, which may include the above-mentioned chip package structure.

The disclosure further provides an electronic device, which may include the above-mentioned board card.

According to a second aspect of the disclosure, a data processing method is provided. The method may include the following: a task configuration information storage unit stores configuration information of tasks; a task queue configuration unit configures a task queue according to the configuration information stored in the task configuration information storage unit.

In some examples, the task configuration information storage unit stores multiple task queues into storage units of the task configuration information storage unit according to the configuration information.

In some examples, the configuration information may include start tags of the tasks, and/or end tags of the tasks, and/or priorities of the tasks, and/or launching manners for the tasks.

In some examples, a first storage unit of the storage units stores a first task queue, and a second storage unit of the storage units stores a second task queue.

In some examples, the first task queue may include a high-priority task queue, and the second task queue may include a low-priority task queue.

In some examples, an external device provides the configuration information and executes the task queue.

In some examples, the external device sends the configuration information to the task configuration information storage unit.

In some examples, the task queue configuration unit sends a configured task queue to the external device. The external device executes tasks in the configured task queue and sends a first end signal to the task configuration information storage unit every time a task is completed. The task configuration information storage unit sends an interrupt signal to the external device every time a first end signal is received. The external device processes the interrupt signal and sends a second end signal to the task configuration information storage unit.

In some examples, the task configuration information storage unit modifies stored configuration information of a task after receiving the first end signal.

In some examples, the external device may include one or more processor cores.

In some examples, a control module of the processor core provides the configuration information, and an operation module executes the task queue.

In some examples, the control module sends the configuration information to the task configuration information storage unit.

In some examples, the task queue configuration unit sends a configured task queue to a control unit. The control unit monitors the configuration information of a self-launching task queue device, configures an operation instruction of a storage unit, controls an operation unit and the storage unit to execute the tasks in the task queue and sends a first end signal to the task configuration information storage unit every time a task is completed. The task configuration information storage unit sends an interrupt signal to the control unit every time a first end signal is received. The control unit processes the interrupt signal and sends a second end signal to the task configuration information storage unit.

In some examples, the operation unit may include a primary processing circuit and multiple secondary processing circuits. The operation unit may include a tree module, the tree module may include a root port and multiple branch ports, the root port of the tree module is coupled with the primary processing circuit, and each of the multiple branch ports of the tree module is coupled with a secondary processing circuit of the multiple secondary processing circuits respectively. The tree module is configured to forward data blocks, weights, and operation instructions between the primary processing circuit and the multiple secondary processing circuits.

In some examples, the operation unit may include a primary processing circuit, multiple secondary processing circuits, and multiple branch processing circuits. The primary processing circuit divide tasks in the task queue into multiple data blocks and sends at least one data block of the multiple data blocks, weights, and at least one operation instruction of multiple operation instructions to the multiple branch processing circuits.

The multiple branch processing circuits are configured to forward the at least one data block, the weights, and the at least one operation instruction between the primary processing circuit and the multiple secondary processing circuits.

The multiple secondary processing circuits are configured to execute computation on the at least one data block and the weights received according to the at least one operation instruction to obtain intermediate results and transmit the intermediate results to the multiple branch processing circuits.

The primary processing circuit is configured to perform subsequent processing on the intermediate results sent by the multiple branch processing circuits to obtain a result of the at least one operation instruction and to send the result of the at least one operation instruction to the control unit.

In some examples, the operation unit may include a primary processing circuit and multiple secondary processing circuits. The multiple secondary processing circuits are arranged in an array distribution. Each secondary processing circuit is coupled with other adjacent secondary processing circuits, the primary processing circuit is coupled with k secondary processing circuits of the multiple secondary processing circuits, and the k secondary processing circuits include n secondary processing circuits in a first row, n secondary processing circuits in an m^(th) row and m secondary processing circuits in a first column.

The k secondary processing circuits are configured to forward data and instructions between the primary processing circuit and the multiple secondary processing circuits.

The primary processing circuit is configured to divide a piece of input data into multiple data blocks and to send at least one data block of the multiple data blocks and at least one operation instruction of multiple operation instructions to the k secondary processing circuits.

The k secondary processing circuits are configured to convert the data between the primary processing circuit and the multiple secondary processing circuits.

The multiple secondary processing circuits are configured to execute computation on the received data block according to the at least one operation instruction to obtain intermediate results and to transmit the intermediate results to the k secondary processing circuits.

The primary processing circuit is configured to perform subsequent processing on the intermediate results sent by the k secondary processing circuits to obtain a result of the operation instruction and to send the result of the at least one operation instruction to the control unit.

In some examples, the primary processing circuit is configured to combine and sequence the intermediate results sent by the multiple secondary processing circuits to obtain the result of the operation instruction.

In some examples, the primary processing circuit is configured to combine, sequence, and activate the intermediate results sent by the multiple processing circuits to obtain the result of the operation instruction.

In some examples, the primary processing circuit may include at least one selected from a group consisting of a conversion processing circuit, an activation processing circuit, and an addition processing circuit.

The conversion processing circuit is configured to execute preprocessing on the data. The specific operations are as follows. Exchange between a first data structure and a second data structure is executed for data or intermediate results received by the primary processing circuit, or exchange between a first data type and a second data type is executed for the data or intermediate results received by the primary processing circuit.

The activation processing circuit is configured to execute subsequent processing, that is, executing activation computation on data in the primary processing circuit.

The addition processing circuit is configured to execute subsequent processing, that is, executing addition computation or accumulation computation.

In some examples, the secondary processing circuit may include a multiplication processing circuit.

The multiplication processing circuit is configured to execute multiplication computation on the received data block to obtain a multiplication result.

In some examples, the secondary processing circuit may further include an accumulation processing circuit, and the accumulation processing circuit is configured to execute accumulation computation on the multiplication result to obtain an intermediate result.

In some examples, the tree module is configured as an n-ary tree structure, n being an integer greater than or equal to two.

In some examples, the control unit configures the operation instruction in the storage unit, which may include that an instruction in an external storage module in the storage unit is input into an instruction storage module.

In some examples, the storage unit stores data and instructions for neural network operation. The control unit controls the storage unit and a neural network operation unit to execute the tasks in the task queue. The operation unit may include the neural network operation unit. The neural network operation unit executes neural network operation on the data according to instructions stored in the storage unit.

In some examples, the storage unit stores data and instructions for universal computation. The control unit controls the storage unit and a universal operation unit to execute the tasks in the task queue. The operation unit may include the universal operation unit. The universal operation unit executes universal computation on the data according to the instructions stored in the storage unit.

In some examples, the device may further include a data cache, an instruction cache, and a DMA. The data cache caches data, intermediate results, and computational results. The instruction cache caches the instruction. The DMA serves as a data interface between the storage unit and the data cache or a data interface between the storage unit and the instruction cache.

In some examples, an input neuron cache is configured to cache input neurons; a weight cache is configured to cache weights; and an output neuron cache is configured to cache output neurons.

In some examples, the neural network operation may include multiplication computation, and/or addition computation, and/or activation computation, and/or pooling computation, and/or convolutional computation, and/or fully coupled computation, and/or vector inner product computation, and/or nonlinear computation.

In some examples, the multiplication computation is executed by multiplying first input data and second input data to obtain an output.

From the technical solutions, it may be seen that the first aspect and the second aspect of the disclosure at least have the following advantageous effects.

(1) The external device may access the task configuration information storage unit of the self-launching task queue device anytime to know a present task state, so that an execution state of the present task may be effectively monitored.

(2) The external device may modify configuration information stored in the task configuration information storage unit of the self-launching task queue device anytime, so that the task may be scheduled.

It should be noted that, in the related art, a data redundancy technology improves security and reliability of data by adopting a replica redundancy or an error correcting code (ECC) manner. However, the data redundancy technology brings a huge storage capacity overhead and a memory access power consumption overhead, which may become more serious for massive data. Therefore, how to combine features of data for data redundancy becomes a problem needed to be solved. For the problem of an existing solution, the disclosure further provides a data redundancy method and device, to overcome shortcomings of the existing technical solution.

According to a third aspect of the disclosure, a data redundancy method is provided, which may include the follows. Data is divided into M importance ranks; important bit of each piece of data in each importance rank is extracted; data redundancy processing is carried out on the important bit, where M is a positive integer.

In some examples, data redundancy processing may include replica redundancy processing and/or ECC processing.

In some examples, ECC processing may include cyclic redundancy check (CRC) and/or error checking and correcting (ECC).

In some examples, performing ECC processing on the data may include the follows. Redundancy storage is performed on the data with a CRC manner. When a read operation is executed, a stored CRC code is read, a CRC code operation is performed on raw data, and if the two CRC codes are inconsistent, the data is corrected according to the stored CRC code. When a write operation is executed, both of the raw data and the CRC code of the data are stored.

In some examples, performing ECC processing on the data may include the follows. An ECC memory is adopted for redundancy storage of the data. When the read/write operation is executed, the ECC memory automatically performs ECC processing.

In some examples, the replica redundancy processing may include simultaneously backuping of N replicas, where N is a positive integer greater than or equal to two.

In some examples, performing replica redundancy processing on the important bits of the data may include the follows. When a read operation is executed, for the important bits, the raw data and N backed-up data which are consistent are simultaneously read, in case of data inconsistency, N backed-up data are determined as finally read data, and the (N+1)^(th) data which is inconsistent with the raw data is simultaneously modified. When the write operation is executed, the important bits are simultaneously written back to N backed-up addresses, to ensure that the data in the raw data is consistent with the N backed-up data.

In some examples, dividing the data into the M importance ranks may include dividing the data according to at least one of a size of the data, an absolute value of the data, a type of the data, a read operation frequency of the data, and a write operation frequency of the data.

In some examples, when the data may include neural network parameters, M importance ranks are divided according to absolute values of the neural network parameters, and M+1 threshold values T₀, T₁, T₂, . . . , and T_(M) are set in descending order, and when an absolute value D of a neural network parameter meets T_(i-1)>D>T_(i), data corresponding to the neural network parameter is divided into the i^(th) importance rank, where i=1, 2, . . . , M, and T₀, T₁, T₂, . . . , and T_(M) are all real numbers and T₀>T₁>T₂> . . . >T_(M)≤0.

In some examples, when the data may include sparse neural network parameters, and the sparse neural network parameters include nonzero parameters and nonzero parameter positions, the nonzero parameter positions are configured as a first importance rank, M−1 importance ranks are divided for the nonzero parameters according to absolute values of the parameters, and M threshold values T₁, T₂, . . . , and T_(M) are set in descending order, and when the absolute value D of the nonzero parameter meets T_(i-1)>D>T_(i), the data is divided into the i^(th) importance rank, where i=2, 3 . . . , and M, and T₁, T₂, . . . , and T_(M) are all real numbers and T₁>T₂> . . . >T_(M)≤0.

In some examples, when the data may include diagram computation application data which may include vertex data and side data, the vertex data is configured as a first importance rank, M−1 importance ranks are divided for the side data according to access frequencies, and M threshold values T₁, T₂, . . . , and T_(M) are set in descending order, and when a access frequency F of side data meets T_(i-1)>F>T_(i), the side data is divided into the i^(th) importance rank, where i=2, 3 . . . , and M, and T₁, T₂, . . . , and T_(M-1) are all real numbers and T₁>T₂> . . . >T_(M)≤0.

In some examples, extracting the important bits of each piece of data corresponding to each importance rank may include the follows. If the data is a floating point parameter, sign bit and first y bits of an exponent part and a base part are set as the important bits, and y is a positive integer; and/or if the data is a fixed point parameter, sign bit and first z bits of a numerical part are set as the important bits, and z is a positive integer.

In some examples, redundancy storage may be performed on a control unit, and redundancy storage is not performed on an operation unit. For example, redundancy storage is performed on a neural network instruction; redundancy storage is not performed on a parameter; the neural network instruction is configured as the first importance rank; and the neural network parameter is configured as a second importance rank. The neural network parameter may include topological structure information, neuron data, and weight data. Redundancy storage is performed on data of the first importance rank and redundancy storage is not performed on data of the second importance rank. When a read operation is executed on the data of the first importance rank, raw data and two backed-up data are read, in case of corresponding data inconsistency, two backed-up data which are the same are determined as finally read data, and the third backed-up data which is inconsistent is simultaneously modified. When a write operation is executed on the data of the first importance rank, the data is simultaneously written back to two backed-up addresses, and the raw data and the two backed-up data are ensured to be consistent.

In some examples, a neural network processor may include a storage unit, a control unit, and an operation unit.

The storage unit is configured to receive external input data, to store neurons, weights, and an instruction of a neural network, to send the instruction to the control unit, and to send the neurons and the weights to the operation unit.

The control unit is configured to receive the instruction sent by the storage unit and to decode the instruction to generate control information to control the operation unit.

The operation unit is configured to receive the weights and the neurons sent by the storage unit, to complete neural network training computation, and to transmit output neurons to the storage unit for storage.

The neural network processor may further include an instruction redundancy processing unit. The instruction redundancy processing unit is embedded in the storage unit and the instruction control unit respectively to perform data redundancy processing on the instruction.

In some examples, the operation unit may include a primary processing circuit and multiple secondary processing circuits. Specifically, the operation unit may be a tree module. The tree module may include a root port and multiple branch ports, where the root port of the tree module is coupled with the primary processing circuit, and each of the multiple branch ports of the tree module is coupled with a secondary processing circuit of the multiple secondary processing circuits respectively. The tree module is configured to forward data blocks, weights, and operation instructions between the primary processing circuit and the multiple secondary processing circuits. As illustrated in FIG. 11, the tree module may include a multilayer node structure; a node is a structure with a forwarding function; and the node may have no computation function.

In some examples, the operation unit may include a primary processing circuit, multiple secondary processing circuits, and multiple branch processing circuits. The primary processing circuit is configured to divide an input neuron into multiple data blocks and to send at least one data block of the multiple data blocks, weights, and at least one operation instruction of multiple operation instructions to the multiple branch processing circuits.

The multiple branch processing circuit are configured to forward the at least one data block, the weights, and the at least one operation instruction between the primary processing circuit and the multiple secondary processing circuits.

The multiple secondary processing circuits are configured to execute computation on the at least one data block and the weights received according to the at least one operation instruction to obtain intermediate results and to transmit the intermediate results to the branch processing circuit.

The primary processing circuit is configured to perform subsequent processing on the intermediate results sent by the multiple branch processing circuits to obtain a result of the at least one operation instruction and to send the result of the operation instruction to the control unit.

In some examples, the operation unit may include a primary processing circuit and multiple secondary processing circuits. The multiple secondary processing circuits are arranged in an array distribution. Each secondary processing circuit is coupled with other adjacent secondary processing circuits. The primary processing circuit is coupled with k secondary processing circuits among the multiple primary processing circuits. The k secondary processing circuits include n secondary processing circuits in a first row, n secondary processing circuits in an m^(th) row, and m secondary processing circuits in a first column.

The k secondary processing circuits are configured to forward data and instructions between the primary processing circuit and the multiple secondary processing circuits.

The primary processing circuit is configured to divide a piece of input data into multiple data blocks and to send at least one data block of the multiple data blocks and at least one operation instruction of multiple operation instructions to the k secondary processing circuits.

The k secondary processing circuits are configured to convert data between the primary processing circuit and the multiple secondary processing circuits.

The multiple secondary processing circuits are configured to execute computation on the received data block according to the at least one operation instruction to obtain intermediate results and to transmit the intermediate results to the k secondary processing circuits.

The primary processing circuit is configured to perform subsequent processing on the intermediate results sent by the k secondary processing circuits to obtain a result of the at least one operation instruction and to send the result of the at least one operation instruction to the control unit.

In some examples, the primary processing circuit is configured to combine and sequence the intermediate results sent by the multiple secondary processing circuits to obtain the result of the operation instruction.

In some examples, the primary processing circuit is configured to combine, sequence, and activate the intermediate results sent by the multiple processing circuits to obtain the result of the operation instruction.

In some examples, the primary processing circuit may include at least one selected from a group consisting of a conversion processing circuit, an activation processing circuit, and an addition processing circuit.

The conversion processing circuit is configured to execute preprocessing on the data. The specific operations are as follows. Exchange between a first data structure and a second data structure is executed for data or intermediate results received by the primary processing circuit, or exchange between a first data type and a second data type is executed for the data or intermediate results received by the primary processing circuit.

The activation processing circuit is configured to execute subsequent processing, that is, executing activation computation on data in the primary processing circuit.

The addition processing circuit is configured to execute subsequent processing, that is, executing addition computation or accumulation computation.

In some examples, the secondary processing circuit may include a multiplication processing circuit.

The multiplication processing circuit is configured to execute multiplication computation on the received data block to obtain a multiplication result.

In some examples, the secondary processing circuit may further include an accumulation processing circuit, and the accumulation processing circuit is configured to execute accumulation computation on the multiplication result to obtain an intermediate result.

In some examples, the tree module is configured as an n-ary tree structure, and n is an integer greater than or equal to two.

According to a fourth aspect of the disclosure, a data redundancy device is provided, which may include an importance rank dividing unit, an important bit extracting unit, and a data redundancy processing unit. The importance rank dividing unit is configured to divide data into M importance ranks. The important bit extraction unit is configured to extract important bits of each piece of data in each importance rank. The data redundancy processing unit is configured to perform data redundancy processing on the important bits, where M is a positive integer.

In some examples, data redundancy processing may include replica redundancy processing and/or ECC processing, and the data redundancy processing unit may include a redundancy storage unit and a read/write control unit. The redundancy storage unit is configured to store redundant data, and the read/write control unit is configured to read and/or write data.

In some examples, the ECC processing may include CRC and/or ECC.

In some examples, performing ECC processing on the data may include the follows. The redundancy storage unit performs redundancy storage on the data with a CRC manner. When the read/write control unit executes a read operation, a stored CRC code is read, a CRC code operation is performed on raw data, and if the two CRC codes are inconsistent, the data is corrected according to the stored CRC code. When the read/write control unit executes a write operation, the redundancy storage unit stores both of the raw data and the CRC code of the data.

In some examples, performing ECC processing on the data may include the follows. An ECC memory is adopted for redundancy storage of the data. When the read/write operation is executed, the ECC memory automatically performs ECC processing.

In some examples, replica redundancy processing may include simultaneous backuping of N replicas, where N is a positive integer greater than or equal to two.

In some examples performing replica redundancy processing on the important bits of the data may include the follows. When the read/write control unit executes a read operation, for the important bits, the raw data and the N backed-up data are simultaneously read, in case of data inconsistency, N backed-up data which are consistent are determined as finally read data, and the (N+1)^(th) data which is inconsistent with the raw data is simultaneously modified. When the read/write control unit executes the write operation, the important bits are simultaneously written back to N backed-up addresses, and meanwhile, the redundancy storage unit ensures that the data in the raw data and the N data replicas are consistent.

In some examples, the importance rank division unit dividing the data into the M importance ranks may include the follows. Division is performed according to at least one of a size of the data, an absolute value of the data, a type of the data, a read operation frequency of the data, and a write operation frequency of the data.

In some examples, when the data may include neural network parameters, M importance ranks are divided according to absolute values of the neural network parameters, and M+1 threshold values T₀, T₁, T₂, . . . , and T_(M) are set in descending order, and when an absolute value D of a neural network parameter meets T_(i-1)>D>T_(i), the data corresponding to the neural network parameter is divided into the i^(th) importance rank, where i=1, 2 . . . , and M, T₀, T₁, T₂, . . . , and T_(M) are all real numbers and T₀>T₁>T₂> . . . >TM≤0.

In some examples, when the data may include sparse neural network parameters, and the sparse neural network parameters include nonzero parameters and nonzero parameter positions, the nonzero parameter positions are configured as a first importance rank, M−1 importance ranks are divided for the nonzero parameters according to absolute values of the parameters, and M threshold values T₁, T₂, . . . , and T_(M) are set in descending order, and when the absolute value D of the nonzero parameter meets T_(i-1)>D>T_(i), the data is divided into the i^(th) importance rank, where i=2, 3 . . . , and M, and T₁, T₂, . . . , and T_(M) are all real numbers and T₁>T₂> . . . >T_(M)≤0.

In some examples, when the data may include diagram computation application data which may include vertex data and side data, the vertex data is configured as a first importance rank, M−1 importance ranks are divided for the side data according to an access frequencies, and M threshold values T₁, T₂, . . . , and T_(M) are set in descending order, and when a access frequency F of side data meets T_(i-1)>F>T_(i), the side data is divided into the i^(th) importance rank, where i=2, 3 . . . , and M, and T₁, T₂, . . . , and T_(M-1) are all real numbers and T₁>T₂> . . . >T_(M)≤0.

In some examples, the important bit extraction unit extracting the important bits of each piece of data corresponding to each importance rank may include the follows. If the data is a floating point parameter, sign bits and first y bits of an exponent part and a base part are set as the important bits, and y is a positive integer; and/or, if the data is a fixed point parameter, sign bits and first z bits of a numerical part are set as the important bits, and z is a positive integer.

In some examples, redundancy storage may be performed on a control unit, and redundancy storage is not performed on an operation unit. For example, redundancy storage is performed on a neural network instruction; redundancy storage is not performed on a parameter; the neural network instruction is configured as the first importance rank; and the neural network parameter is configured as a second importance rank. The neural network parameter may include topological structure information, neuron data and weight data. Redundancy storage is performed on the data of the first importance rank and redundancy storage is not performed on data of the second importance rank. When a read operation is executed on the data of the first importance rank, raw data and two backed-up data are read, in case of corresponding data inconsistency, two backed-up data which are the same are determined as finally read data, and the third backed-up data which is inconsistent is simultaneously modified. When a write operation is executed on the data of the first importance rank, the data is simultaneously written back to two backed-up addresses, and the raw data and the two backed-up data are ensured to be consistent.

In some examples, a neural network processor may include a storage unit, a control unit, and an operation unit.

The storage unit is configured to receive external input data, to store neurons, weights, and an instruction of a neural network, to send the instruction to the control unit, and to send the neurons and the weights to the operation unit.

The control unit is configured to receive the instruction sent by the storage unit and to decode the instruction to generate control information to control the operation unit.

The operation unit is configured to receive the weights and the neurons sent by the storage unit, to complete neural network training computation, and to transmit output neurons to the storage unit for storage.

The neural network processor may further include an instruction redundancy processing unit. The instruction redundancy processing unit is embedded in the storage unit and the instruction control unit respectively to perform data redundancy processing on the instruction.

In some examples, redundancy storage may be performed on the control unit, and redundancy storage is not performed on the operation unit. For example, redundancy storage is performed on the neural network instruction; redundancy storage is not performed on the parameter; the neural network instruction is configured as the first importance rank; and the neural network parameter is configured as a second importance rank. The neural network parameter may include topological structure information, neuron data, and weight data. Redundancy storage is performed on the data of the first importance rank and redundancy storage is not performed on the data of the second importance rank. When a read operation is executed on the data of the first importance rank, raw data and two backed-up data are read, in case of corresponding data inconsistency, two backed-up data which are the same are determined as finally read data, and the third backed-up data which is inconsistent is simultaneously modified. When a write operation is executed on the data of the first importance rank, the data is simultaneously written back to two backed-up addresses, and meanwhile, the raw data and the two backed-up data are ensured to be consistent.

In some examples, a neural network processor may include a storage unit, a control unit, and an operation unit.

The storage unit is configured to receive external input data, to store neurons, weights, and an instruction of a neural network, to send the instruction to the control unit, and to send the neurons and the weights to the operation unit.

The control unit is configured to receive the instruction sent by the storage unit and to decode the instruction to generate control information to control the operation unit.

The operation unit is configured to receive the weights and the neurons sent by the storage unit, to complete neural network training computation, and to transmit output neurons to the storage unit for storage.

The neural network processor may further include an instruction redundancy processing unit. The instruction redundancy processing unit is embedded in the storage unit and the instruction control unit respectively to perform data redundancy processing on the instruction.

In some examples, the operation unit may include a primary processing circuit and multiple secondary processing circuits. Specifically, the operation unit may be a tree module. The tree module may include a root port and multiple branch ports, where the root port of the tree module is coupled with the primary processing circuit, and each of the multiple branch ports of the tree module is coupled with a secondary processing circuit of the multiple secondary processing circuits respectively. The tree module is configured to forward data blocks, weights, and operation instructions between the primary processing circuit and the multiple secondary processing circuits. As illustrated in FIG. 11, the tree module may include a multilayer node structure, where a node is a structure with a forwarding function, and the node may have no computation function.

In some examples, the operation unit may include a primary processing circuit, multiple secondary processing circuits, and multiple branch processing circuits. The primary processing circuit is specifically configured to divide an input neuron into multiple data blocks and to send at least one data block of the multiple data blocks, weights, and at least one operation instruction of multiple operation instructions to the multiple branch processing circuits.

The multiple branch processing circuit are configured to forward the at least one data block, the weights, and the at least one operation instruction between the primary processing circuit and the multiple secondary processing circuits.

The multiple secondary processing circuits are configured to execute computation on the at least one data block and the weights received according to the at least one operation instruction to obtain intermediate results, and to transmit the intermediate results to the branch processing circuit.

The primary processing circuit is configured to perform subsequent processing on the intermediate results sent by the multiple branch processing circuits to obtain a result of the at least one operation instruction and to send the result of the operation instruction to the control unit.

In some examples, the operation unit may include a primary processing circuit and multiple secondary processing circuits. The multiple secondary processing circuits are arranged in an array distribution; each secondary processing circuit is coupled with other adjacent secondary processing circuits; the primary processing circuit is coupled with k secondary processing circuits among the multiple primary processing circuits; and the k secondary processing circuits include n secondary processing circuits in a first row, n secondary processing circuits in an m^(th) row, and m secondary processing circuits in a first column.

The k secondary processing circuits are configured to forward data and instructions between the primary processing circuit and the multiple secondary processing circuits.

The primary processing circuit is configured to divide a piece of input data into multiple data blocks and to send at least one data block of the multiple data blocks and at least one operation instruction of multiple operation instructions to the k secondary processing circuits.

The k secondary processing circuits are configured to convert the data between the primary processing circuit and the multiple secondary processing circuits.

The multiple secondary processing circuits are configured to execute computation on the received data block according to the at least one operation instruction to obtain intermediate results and to transmit the intermediate results to the k secondary processing circuits.

The primary processing circuit is configured to perform subsequent processing on the intermediate results sent by the k secondary processing circuits to obtain a result of the at least one operation instruction and to send the result of the at least one operation instruction to the control unit.

In some examples, the primary processing circuit is configured to combine and sequence the intermediate results sent by the multiple secondary processing circuits to obtain the result of the operation instruction.

In some examples, the primary processing circuit is configured to combine, sequence and activate the intermediate results sent by the multiple processing circuits to obtain the result of the operation instruction.

In some examples, the primary processing circuit may include at least one selected from a group consisting of a conversion processing circuit, an activation processing circuit, and an addition processing circuit;

The conversion processing circuit is configured to execute preprocessing on the data. The specific operations are as follows. Exchange between a first data structure and a second data structure is executed for data or intermediate results received by the primary processing circuit, or exchange between a first data type and a second data type is executed for the data or intermediate results received by the primary processing circuit.

The activation processing circuit is configured to execute subsequent processing, that is, executing activation computation on data in the primary processing circuit.

The addition processing circuit is configured to execute subsequent processing, that is, executing addition computation or accumulation computation.

In some examples, the secondary processing circuit may include a multiplication processing circuit.

The multiplication processing circuit is configured to execute multiplication computation on the received data block to obtain a multiplication result.

In some examples, the secondary processing circuit may further include an accumulation processing circuit, and the accumulation processing circuit is configured to execute accumulation computation on the multiplication result to obtain an intermediate result.

In some examples, the tree module is configured as an n-ary tree structure, and n is an integer greater than or equal to two.

From the above-mentioned technical solutions, it may be seen that the third aspect and fourth aspect of the disclosure at least have the following advantageous effects.

Redundancy processing is selectively performed on the data, so that a storage capacity overhead and memory access power consumption overhead may be reduced.

The importance ranks of the data are distinguished, and different redundancy processing is performed on data at different importance ranks, so that security and reliability of the data are ensured, and storage capacity occupying and memory access power consumption may be reduced.

It should be noted that neural networks (NN) have been widely used. However, when a neural network processor is applied in a neural network application, huge energy consumption may be generated, including memory access energy consumption and computation energy consumption, and a relatively high current in a circuit reduces stability and service life of the neural network processor. Therefore, how to reduce energy consumption in a neural network application becomes a problem needed to be solved. Dynamic voltage frequency scaling (DVFS) dynamically scales a working frequency and a working voltage of a processor according to a real-time load requirement of the processor, thereby reducing power consumption of a chip. However, the conventional DVFS does not consider a topological structure, network scale, fault-tolerant capability, and the like of a neural network, and thus power consumption of a chip for a neural network application may not be effectively reduced. Therefore, it is desirable to extend a frequency and voltage scaling range in combination with the characteristics of the neural network, so as to further reduce power consumption of the neural network processing.

Examples of disclosure further provide a DVFS method and a DVFS co-processor, so as to solve at least one of the above-mentioned technical problems.

According to a fifth aspect of the disclosure, a DVFS method is provided, which may include the following operations.

A processor load and a neural network configuration signal within a time period of T−t˜T are acquired. A frequency of a processor in a next time period of T˜T+t is predicted, where both of T and t are real numbers greater than zero.

In some examples, the method may further include the following. A voltage of the processor in the next time period of T˜T+t is predicted according to the frequency predicted.

In some examples, the frequency of the processor in the next time period predicted may include: a frequency of a storage unit and/or a computation unit.

In some examples, the frequency of the processor in the next time period of T˜T+t is predicted as follows. For the computation unit, m frequency scaling ranges are preset, generating m+1 frequency segmentation points f₀, f₁, . . . , and f_(m) in total, where f₀<f₁< . . . <f_(m), f₀, f₁, . . . , and f_(m) are real numbers greater than 0, and m is a positive integer greater than 0.

In some examples, the frequency of the processor in the next time period of T˜T+t is predicted as follows. m neural network scales are preset, generating m+1 scale division points n₀, n₁, . . . , n_(m) in total, where n₀<n₁< . . . <n_(m), n₀n₁, . . . , and n_(m) are positive integers greater than 0, and m is a positive integer greater than 0.

In some examples, the frequency of the processor in the next time period of T˜T+t is predicted as follows. A frequency scaling range of the computation unit is determined according to a scale n of a present processing layer, and if n_(i-1)<n<n_(i), the frequency scaling range of the computation unit is f_(i-1)<f<f_(i).

In some examples, the frequency of the processor in the next time period of T˜T+t is predicted as follows. The frequency scaling range of the computation unit is further narrowed according to the type of the present processing layer. Layers are divided into two types, that is, a compute-intensive layer and a memory access-intensive layer, where the compute-intensive layer may include a convolutional layer, and the memory access-intensive layer may include a fully coupled layer, a pooling layer, and an active layer. If the layer is a compute-intensive layer, the frequency scaling range of the computation unit is (f_(i-1)+f_(i))/2<f<f_(i); if the layer is a memory access-intensive layer, the frequency scaling range of the computation unit is f_(i-1)/2<f<(f_(i-1)+f_(i))/2.

In some examples, the frequency of the processor in the next time period of T˜T+t is predicted as follows. Fine granularity regulation is performed on the frequency of the computation unit according to present time accuracy of the neural network, when the present accuracy of the neural network is higher than an expected accuracy, the frequency of the computation unit is decreased, and when the present accuracy of the neural network is lower than an expected accuracy, the frequency of the computation unit is increased.

In some examples, the frequency of the processor in the next time period of T˜T+t is predicted as follows. For the storage unit, k frequency scaling ranges are preset, generating k+1 frequency segmentation points F₀, F₁, . . . , and F_(k) in total, where F₀<F₁< . . . <F_(k), F₀<F₁, . . . , F_(k) are real numbers greater than zero, and k is a positive integer greater than zero.

In some examples, the frequency of the processor in the next time period of T˜T+t is predicted as follows. k neural network scales are preset, generating k+1 scale segmentation points N₀, N₁, . . . , and N_(k) in total, where N₀<N₁< . . . <N_(k), N₀, N₁, . . . , N_(k) are positive integers greater than zero, and k is a positive integer greater than zero.

In some examples, the frequency of the processor in the next time period of T˜T+t is predicted as follows. A frequency scaling range of the storage unit is determined according to a scale N of a present processing layer, and if N_(i-1)<N<N_(i), the frequency scaling range of the storage unit is F_(i-1)<F<F_(i).

In some examples, the frequency of the processor in the next time period of T˜T+t is predicted as follows.

The frequency scaling range of the storage unit is further narrowed according to the type of the present processing layer. Layers are divided into two types, that is, a compute-intensive layer and a memory access-intensive layer. The compute-intensive layer may include a convolutional layer. The memory access-intensive layer may include a fully coupled layer, a pooling layer, and an active layer. If the layer is a compute-intensive layer, the frequency scaling range of the storage unit is F_(i-1)<F<(F_(i-1)+F_(i))/2, and if the layer is a memory access-intensive layer, the frequency scaling range of the storage unit is (F_(i-1)+F_(i))/2<F<F_(i).

In some examples, the frequency of the processor in the next time period of T˜T+t is predicted as follows. Fine granularity regulation is performed on the frequency of the storage unit according to present accuracy of the neural network. When the present accuracy of the neural network is higher than an expected accuracy, the memory access frequency of the storage unit is decreased, and when the present accuracy of the neural network is lower than the expected accuracy, the memory access frequency of the storage unit is increased.

In some examples, the method may further include follows. When the frequency needs to be decreased, the frequency is decreased at first, and then a voltage is decreased. When the frequency needs to be increased, the voltage is increased at first, and then the frequency is increased.

In some examples, after the frequency of the processor in the next time period of T˜T+t is predicted, the method may further include the following. A clock setting of a chip is regulated to scale the frequency of the processor.

In some examples, the method may further include follows. A power management module of the chip is regulated, thereby scaling the voltage supplied to the processor.

In some examples, the neural network configuration signal is acquired as follows. A present layer type and present layer scale for processing of the neural network and real-time accuracy of the neural network are acquired.

According to a sixth aspect of the disclosure, a DVFS co-processor is provided, which may include a signal acquisition unit and a performance prediction unit.

The signal acquisition unit is configured to acquire a workload of a processor and further configured to acquire a neural network configuration signal.

The performance prediction unit is configured to receive the neural network configuration signal and to predict a frequency and a voltage of the processor in a next time period according to a present load of the processor.

In some examples, the performance prediction unit is configured to predict the voltage and the frequency of the processor in the next time period and the frequency may include a frequency of a storage unit and/or a computation unit.

In some examples, the co-processor may further include a frequency scaling unit configured to receive a frequency signal, predicted by the performance prediction unit, of the processor in the next time period and to scale the frequency of the storage unit and/or computation unit in the processor.

In some examples, the co-processor may further include a voltage scaling unit configured to receive a voltage signal, predicted by the performance prediction unit, of the processor in the next time period and to scale a voltage of the storage unit and/or computation unit in the processor.

In some examples, the performance prediction unit configured to predict the frequency of the computation unit in the next time period is configured to perform the follows. For the computation unit m frequency scaling ranges are preset, generating m+1 frequency segmentation points f₀, f₁, . . . , and f_(m) in total, where f₀<f₁< . . . <f_(m), f₀, f₁, . . . , and f_(m) are real numbers greater than zero, and m is a positive integer greater than zero.

In some examples, the performance prediction unit configured to predict the frequency of the computation unit in the next time period is configured to preset m segments of neural network scales, generating m+1 scale division points n₀, n₁, . . . , n_(m) in total, where n₀<n₁< . . . <n_(m), n₀, n₁, . . . , n_(m) are positive integers greater than zero and m is a positive integer greater than zero.

In some examples, the operation that the frequency of the computation unit in the next time period is predicted in the performance prediction unit may include that: a frequency scaling range of the computation unit is determined according to a range of a scale n of a present processing layer, and if n_(i-1)<n<n_(i), the frequency scaling range of the computation unit is f_(i-1)<f<f_(i).

In some examples, the operation that the frequency of the computation unit in the next time period is predicted in the performance prediction unit may include that: the frequency scaling range of the computation unit is further narrowed according to the type of the present processing layer; if the layer is a compute-intensive layer, the frequency scaling range of the computation unit is (f_(i-1)+f_(i))/2<f<f_(i); and if the layer is a memory access-intensive layer, the frequency scaling range of the computation unit is f _(i-1)/2<f<(f _(i-1) +f _(i))/2.

In some examples, the operation that the frequency of the computation unit in the next time period is predicted in the performance prediction unit may include that: fine granularity regulation is performed on the frequency of the computation unit according to present accuracy of the neural network: when the present accuracy of the neural network is higher than expected accuracy, the frequency of the computation unit is decreased, and when the present accuracy of the neural network is lower than the expected accuracy, the frequency of the computation unit is increased.

In some examples, the operation that the frequency of the storage unit in the next time period is predicted in the performance prediction unit may include that: k segments of frequency scaling ranges are preset for the storage unit, generating k+1 frequency division points F₀, F₁, . . . , F_(k) in total, where F₀<F₁< . . . <F_(k), F₀, F₁, . . . , F_(k) are positive integers greater than zero and k is a positive integer greater than zero.

In some examples, the operation that the frequency of the storage unit in the next time period is predicted in the performance prediction unit may include that: k segments of neural network scales are preset, generating k+1 scale division points N₀, N₁, . . . , N_(k) in total, where N₀<N₁< . . . <N_(k), N₀, N₁, . . . , N_(k) are positive integers greater than zero and k is a positive integer greater than zero.

In some examples, the operation that the frequency of the storage unit in the next time period is predicted in the performance prediction unit may include that: a frequency scaling range of the storage unit is judged according to a range of a scale N of a present processing layer, and if N_(i-1)<N<N_(i), the frequency scaling range of the storage unit is F_(i-1)<F<F_(i).

In some examples, the operation that the frequency of the storage unit in the next time period is predicted in the performance prediction unit may include that: the frequency scaling range of the storage unit is further narrowed according to the type of the present processing layer; if the layer is a compute-intensive layer, the frequency scaling range of the storage unit is F_(i-1)<F<(F_(i-1)+F_(i))/2; and if the layer is a memory access-intensive layer, the frequency scaling range of the storage unit is (F_(i-1)+F_(i))/2<F<F_(i).

In some examples, the operation that the frequency of the storage unit of the processor in the next time period is determined in the performance prediction unit may include that: fine granularity regulation is performed on the frequency of the storage unit according to the present accuracy of the neural network.

In some examples, the operation that the neural network configuration signal is acquired in the signal acquisition unit may include that: a present layer type and a present layer scale for processing of the neural network and real-time accuracy of the neural network are acquired.

In some examples, the performance prediction unit may include at least one of: a preceding value method-based prediction unit, adopting a preceding value method to predict the voltage and the frequency of the processor in the next time period; a moving average load method-based prediction unit, adopting a moving average load method to predict the voltage and the frequency of the processor in the next time period; and an exponentially weighted average method-based prediction unit, adopting an exponentially weighted average method to predict the voltage and the frequency of the processor in the next time period.

From the technical solutions, it may be seen that the fifth aspect and sixth aspect of the disclosure at least have the following beneficial effects.

According to the DVFS method, a real-time load and power consumption of the processor are acquired, and meanwhile, a topological structure of the neural network, the scale of the neural network, and an accuracy requirement of the neural network are acquired. Then, a voltage prediction and frequency prediction method is adopted to scale the working voltage and frequency of the processor. Therefore, performance of the processor is reasonably utilized, and power consumption of the processor is reduced. The DVFS method for the neural network is integrated in the DVFS co-processor, and thus the characteristics of topological structure, network scale, accuracy requirement, and the like of the neural network may be fully mined. The signal acquisition unit acquires a system load signal of the neural network processor, a topological structure signal of the neural network, a neural network scale signal, and a neural network accuracy signal in real time; the performance prediction unit predicts the voltage and the frequency required by the system; the frequency scaling unit scales the working frequency of the neural network processor; and the voltage scaling unit scales the working voltage of the neural network processor. Therefore, the performance of the neural network processor is reasonably utilized, and the power consumption of the neural network processor is effectively reduced.

It should be noted that a universal image recognition device is adopted to recognize a face image at present. The image recognition device may include an expression acquisition unit and an expression recognition unit. The expression acquisition unit acquires an expression of a user, generates an analogue signal and sends it to the expression recognition unit. The expression recognition unit converts the analogue signal into a digital signal, generates an output through a data processing module and finally makes a response to realize an expected function. However, an existing face image recognition device and method have the following defects: poor signal accuracy, face recognition inaccuracy, poor portability, poor function extensibility, design for one or a type of specific devices, and incapability of improving recognition accuracy by virtue of machine learning. For solving or at least partially alleviating the abovementioned technical problems, the disclosure provides an information processing device and method. A face may be recognized more accurately and rapidly. Off-line running of a neural network is supported, and a user terminal/front end may implement face recognition and corresponding control work off line without assistance of any cloud server in computation. High portability and applicability to various application scenarios and devices are achieved, and design cost is greatly reduced.

A seventh aspect of the disclosure provides an information processing device, which may include: a storage unit configured to receive and store data and an instruction; and a data processing unit, connected with the storage unit and configured to receive the data and the instruction sent by the storage unit, to perform extraction and computational processing on a key feature included in the data and to generate a multidimensional vector according to a computational processing result.

In some examples, the key feature may include a facial action, expression, and a corresponding position thereof.

In some examples, the data may include one or more images, and the data processing unit generates a multidimensional vector for each image according to the computational processing result.

In some examples, the image may include a static picture, pictures forming a video, or a video; and the static picture, the pictures forming the video, or the video may include image of one or more parts of a face.

In some examples, the one or more parts of the face include facial muscles, lips, eyes, eyebrows, nose, forehead, ears, and combination thereof of the face.

In some examples, the multidimensional vector is an emotion vector, where each element included in the multidimensional vector represents an emotion on the face, and the emotion may include anger, delight, pain, depression, sleepiness, or doubt.

In some examples, a value of each element of the emotion vector is a number between zero and one, and the value represents a probability of appearance of an emotion corresponding to the element; or the value of each element of the emotion vector is any number greater than or equal to zero, and represents an intensity of the emotion corresponding to the element; or a value of an element of the emotion vector is one, values of the other elements are zero, and the emotion vector represents a strongest emotion.

In some examples, the information processing device may further include a conversion module configured to convert the multidimensional vector into an output, the output including a control instruction, data, a tag, or a picture.

In some examples, the control instruction may include single click, double click, and dragging of a mouse, single touch, multi-touch, and sliding of a touch screen, turning on and turning off of a switch, and a shortcut key.

In some examples, the storage unit is configured to input n images, each image corresponding to a real emotion vector and n being a positive integer greater than or equal to one; and the data processing unit is configured to receive the n images, to calculate an output emotion vector, i.e., a predicted emotion vector, in a format the same as an input, and to update a parameter of the information processing device according to a comparison result of the predicted emotion vector and the real emotion vector.

In some examples, the data processing unit adopts a Euclidean distance or a dot product absolute value method to compare the predicted emotion vector and the real emotion vector.

In some examples, the information processing device is an artificial neural network chip.

In some examples, the data processing unit may include: an operation unit configured to execute corresponding computation on the data according to an instruction stored in the storage unit. The operation unit is a scalar computation unit, a vector computation unit, and/or a hybrid computation unit, and may include a multiplier configured to multiply data input therein to obtain a multiplication output; and/or one or more adders configured to add data input to obtain output data, the multiple adders forming an adder tree configured to execute adder tree computation, namely to add the data input step by step to obtain the output data; an activation function unit configured to execute computation through an activation function to obtain activation output data, the activation function including sigmoid, tan h, rectified linear unit (RELU), or softmax; and a pooling unit configured to execute pooling computation on input data (in) to obtain output data (out) after a pooling operation, namely out=pool(in), where pool is the pooling operation, the pooling operation may include average pooling, maximum pooling, and median pooling, and the input data in is data in a pooling core related to the output data out.

In some examples, the storage unit is configured to store the data and the instruction, where the data may include a neuron, a weight, the image, and the vector. The information processing device may further include: a preprocessing unit configured to preprocess original input data, i.e., one or more images, to obtain image data consistent with a preset parameter and data format of an artificial neural network, preprocessing including segmentation, Gaussian filtering, binarization, regularization, and normalization; an instruction cache unit configured to cache instructions; a weight cache unit configured to cache weight data; an input neuron cache unit configured to cache an input neuron input into the operation unit; an output neuron cache unit configured to cache an output neuron output by the operation unit; a control unit configured to read the instruction from the instruction cache unit, decode the instruction into an operation unit instruction and input the operation unit instruction to the operation unit; and a DMA configured to read and write data or instructions in the storage unit, the instruction cache unit, the weight cache unit, the input neuron cache unit, and the output neuron cache unit.

In some examples, the operation unit may include a short-bit floating point data module configured to execute forward computation, and the short-bit floating point data module may include: a floating point data statistical module configured to perform statistical analysis on data of each type required by artificial neural network forward computation to obtain an exponential length (EL); a short-bit floating point data conversion unit configured to implement conversion from a long-bit floating point data type to a short-bit floating point data type according to the EL obtained by the floating point data statistical module; and a short-bit floating point data operation module configured to, after the floating point data conversion units adopts the short-bit floating point data type to represent all input, weight, and/or offset data required by the artificial neural network forward computation, execute the artificial neural network forward computation on short-bit floating point data.

In some examples, the floating point data statistical module is further configured to perform statistical analysis on the data of each type required by the artificial neural network forward computation to obtain exponential offset; and the short-bit floating point data conversion unit is further configured to implement conversion from the long-bit floating point data type to the short-bit floating point data type according to the exponential offset and EL obtained by the floating point data statistical module.

In some examples, the short-bit floating point data conversion unit may include: an operation cache unit configured to store an intermediate result of the forward computation; a data conversion unit configured to convert data in the operation cache unit into short-bit floating point data; and a rounding unit configured to execute a rounding operation on data beyond a short-bit floating point accuracy range.

In some examples, the rounding unit may include a random rounding unit, a rounding-off unit, a rounding-up unit, a rounding-down unit, and a truncation rounding unit.

In some examples, the random rounding unit executes the following operation:

$y = \left\{ {\begin{matrix} \left\lfloor x \right\rfloor & {{w.p.\mspace{11mu} 1} - \frac{x - \left\lfloor x \right\rfloor}{ɛ}} \\ {\left\lfloor x \right\rfloor + ɛ} & {w.p.\mspace{11mu}\frac{x - \left\lfloor x \right\rfloor}{ɛ}} \end{matrix},} \right.$

where y represents the short-bit floating point data obtained by random rounding; x represents 32-bit floating point data before random rounding; ε is a minimum positive integer which may be represented by a present short-bit floating point data representation format, i.e., 2^(offset-(X-1-EL)); └x┘ represents a number obtained by directly truncating the short-bit floating point data from raw data x; and w.p. represents a probability, that is, a probability that the data y obtained by random rounding is └x┘ is

$\;{1 - \frac{x - \left\lfloor x \right\rfloor}{ɛ}}$ and a probability that the data y obtained by random rounding is └x┘+ε is

$\frac{x - \left\lfloor x \right\rfloor}{ɛ};$

the rounding-off unit executes the following operation:

$y = \left\{ {\begin{matrix} \left\lfloor x \right\rfloor & {{{if}\mspace{14mu}\left\lfloor x \right\rfloor} \leq x \leq {\left\lfloor x \right\rfloor + \frac{ɛ}{2}}} \\ {\left\lfloor x \right\rfloor + ɛ} & {{{{if}\mspace{14mu}\left\lfloor x \right\rfloor} + \frac{ɛ}{2}} \leq x \leq {\left\lfloor x \right\rfloor + ɛ}} \end{matrix},} \right.$

where y represents the short-bit floating point data obtained by rounding-off; x represents the long-bit floating point data before rounding-off; ε is the minimum positive integer which may be represented by the present short-bit floating point data representation format, i.e., 2^(offset-(X-1-EL)); is └x┘ is an integral multiple of ε; and a value of └x┘ is a maximum number less than or equal to x;

the rounding-up unit executes the following operation:

y=┌x┐,

where y represents the short-bit floating point data obtained by rounding-up; x represents the long-bit floating point data before rounding-up; ┌x┐ is the integral multiple of ε; a value of ┌x┐ is a minimum number greater than or equal to x; and ε is the minimum positive integer which may be represented by the present short-bit floating point data representation format, i.e., 2^(offset-(X-1-EL));

the rounding-down unit executes the following operation:

y=└x┘,

where y represents the short-bit floating point data obtained by rounding-down; x represents the long-bit floating point data before rounding-down; └x┘ is the integral multiple of ε; a value of ┌x┐ is the maximum number less than or equal to x; and ε is the minimum positive integer which may be represented by the present short-bit floating point data representation format, i.e., 2^(offset-(X-1-EL)); and

the truncation rounding unit executes the following operation:

y=[x],

where y represents the short-bit floating point data after truncation rounding; x represents the long-bit floating point data before truncation rounding; and [x] represents the number obtained by directly truncating the short-bit floating point data from the raw data x.

According to another aspect of the disclosure, a terminal is further provided, which include the abovementioned information processing device and may further include an image sampling device. The terminal may include a desktop computer, smart home, a transportation means, or a portable electronic device.

According to another aspect of the disclosure, a cloud server is further provided, which may include the abovementioned information processing device.

An eighth aspect of the disclosure further provides an information processing method, which may include that: a storage unit receives and stores data and an instruction; and a data processing unit receives the data and instructions sent by the storage unit, performs extraction and computational processing on a key feature included in the data, and generates a multidimensional vector according to a computational processing result.

In some examples, the key feature may include a facial action and expression, and a corresponding position thereof.

In some examples, the data may include one or more images, and the data processing unit generates a multidimensional vector for each image according to the computational processing result.

In some examples, the image may include a static picture, pictures forming a video, or a video; and the static picture, the pictures forming the video, or the video may include images of one or more parts of a face.

In some examples, the one or more parts of the face include facial muscles, lips, eyes, eyebrows, nose, forehead, ears, and combination thereof of the face.

In some examples, the multidimensional vector is an emotion vector, each element included in the multidimensional vector represents an emotion on the face, and the emotion may include anger, delight, pain, depression, sleepiness, or doubt.

In some examples, a value of each element of the emotion vector is a number between zero and one, and the value represents a probability of appearance of an emotion corresponding to the element; or the value of each element of the emotion vector is any number greater than or equal to zero, and the value represents an intensity of the emotion corresponding to the element; or a value of an element of the emotion vector is one, values of the other elements are zero, and this emotion vector represents a strongest emotion.

In some examples, the information processing method may further include that: a conversion module converts the multidimensional vector into an output, the output including a control instruction, data, a tag, or a picture.

In some examples, the control instruction may include single click, double click, and dragging of a mouse, single touch, multi-touch, and sliding of a touch screen, turning on and turning off of a switch, and a shortcut key.

In some examples, n images are input into the storage unit, each image corresponding to a real emotion vector and n being a positive integer greater than or equal to one; and the data processing unit receives the n images sent by the storage unit, calculates an output emotion vector, i.e., a predicted emotion vector, in a format the same as an input, compares the predicted emotion vector with the real emotion vector and updates a parameter of the information processing method according to a comparison result.

In some examples, the data processing unit adopts a Euclidean distance or a dot product absolute value method to compare the predicted emotion vector and the real emotion vector.

In some examples, an operation unit of the data processing unit executes corresponding computation on the data according to the instruction stored in the storage unit: multiplication computation is executed to multiply an input neuron and weight data; addition computation is executed to add a multiplication computational result step by step through an adder tree to obtain a weighted sum, and an offset is selectively added to the weighted sum; activation function computation is executed to obtain an output neuron, an activation function being a sigmoid function, a tan h function, an RELU function, or a softmax function; and pooling computation is executed, out=pool(in), where pool is a pooling operation, the pooling operation may include, but is not limited to, average pooling, maximum pooling, and median pooling, and input data in is data in a pooling core related to an output out.

In some examples, the information processing method may further include that: a preprocessing unit preprocesses original input data, i.e., one or more images, to obtain image data consistent with an input layer scale of a bottom layer of an artificial neural network used by a chip, preprocessing including segmentation, Gaussian filtering, binarization, regularization, and normalization; the input data is transmitted into the storage unit through the preprocessing unit or is directly transmitted into the storage unit, and the instruction is transmitted into the storage unit, the data including a neuron, a weight, the image and the vector; a DMA receives the data sent by the storage unit and transmits it into a corresponding instruction cache unit, input neuron cache unit and weight cache unit in batches; the control unit reads the instruction from the instruction cache unit and decode it; the operation unit receives the decoded instruction and executes corresponding computation according to the instruction; the operation unit executes neural network operation until computation for all the data is completed to obtain a final computational result, the final computational result being obtained by an output neuron of a last layer of the neural network and each neuron of a final output layer of the neural network corresponding to an element of the emotion vector; the final computational result is transmitted into an output neuron cache unit; and the output neuron cache unit transmits the final computational result into the DMA, and the DMA returns it to the storage unit.

In some examples, the operation unit adopts a short-bit floating point data module for forward computation.

In some examples, the operation that the operation unit adopts the short-bit floating point data module for forward computation may include that: a floating point data statistical module performs statistical analysis on data of each type required by artificial neural network forward computation to obtain an EL; a short-bit floating point data conversion unit implements conversion from a long-bit floating point data type to a short-bit floating point data type according to the EL obtained by the floating point data statistical module; and a short-bit floating point datan operation module, after the floating point data conversion units adopts the short-bit floating point data type to represent all input, weight and/or offset data required by the artificial neural network forward computation, executes the artificial neural network forward computation on short-bit floating point data.

In some examples, the floating point data statistical module performs statistical analysis on the data of each type required by the artificial neural network forward computation to obtain exponential offset; and the short-bit floating point data conversion unit implements conversion from the long-bit floating point data type to the short-bit floating point data type according to the exponential offset and EL obtained by the floating point data statistical module.

In some examples, the step that the short-bit floating point data conversion unit implements conversion from the long-bit floating point data type to the short-bit floating point data type according to the exponential offset and EL obtained by the floating point data statistical module may include that: an operation cache unit stores an intermediate result of the forward computation; a data conversion unit converts data in the operation cache unit into short-bit floating point data; and a rounding unit executes a rounding operation on data beyond a short-bit floating point accuracy range.

In some examples, the rounding unit may include a random rounding unit, a rounding-off unit, a rounding-up unit, a rounding-down unit, and a truncation rounding unit.

In some examples, the random rounding unit executes the following operation:

$y = \left\{ {\begin{matrix} \left\lfloor x \right\rfloor & {{w.p.\mspace{11mu} 1} - \frac{x - \left\lfloor x \right\rfloor}{ɛ}} \\ {\left\lfloor x \right\rfloor + ɛ} & {w.p.\mspace{11mu}\frac{x - \left\lfloor x \right\rfloor}{ɛ}} \end{matrix},} \right.$

where Y represents the short-bit floating point data obtained by random rounding; x represents 32-bit floating point data before random rounding; ε is a minimum positive integer which may be represented by a present short-bit floating point data representation format, i.e., 2^(offset-(X-1-EL)); └x┘ represents a number obtained by directly truncating the short-bit floating point data from raw data X; and w.p. represents a probability, that is, a probability that the data y obtained by random rounding is └x┘ is

$\;{1 - \frac{x - \left\lfloor x \right\rfloor}{ɛ}}$ and a probability that the data y obtained by random rounding is └x┘+ε is

$\frac{x - \left\lfloor x \right\rfloor}{ɛ};$

the rounding-off unit executes the following operation:

$y = \left\{ {\begin{matrix} \left\lfloor x \right\rfloor & {{{if}\mspace{14mu}\left\lfloor x \right\rfloor} \leq x \leq {\left\lfloor x \right\rfloor + \frac{ɛ}{2}}} \\ {\left\lfloor x \right\rfloor + ɛ} & {{{{if}\mspace{14mu}\left\lfloor x \right\rfloor} + \frac{ɛ}{2}} \leq x \leq {\left\lfloor x \right\rfloor + ɛ}} \end{matrix},} \right.$

where y represents the short-bit floating point data obtained by rounding-off; x represents the long-bit floating point data before rounding-off; ε is the minimum positive integer which may be represented by the present short-bit floating point data representation format, i.e., 2^(offset-(X-1-EL)); └x┘ is an integral multiple of ε; and a value of └x┘ is a maximum number less than or equal to x;

the rounding-up unit executes the following operation:

y=┌x┐,

where y represents the short-bit floating point data obtained by rounding-up; x represents the long-bit floating point data before rounding-up; ┌x┐ is the integral multiple of ε; a value of ┌x┐ is a minimum number greater than or equal to x; and ε is the minimum positive integer which may be represented by the present short-bit floating point data representation format, i.e., 2^(offset-(X-1-EL));

the rounding-down unit executes the following operation:

y=└x┘,

where y represents the short-bit floating point data obtained by rounding-down; x represents the long-bit floating point data before rounding-down; └x┘ is the integral multiple of E; a value of └x┘ is the maximum number less than or equal to x; and ε is the minimum positive integer which may be represented by the present short-bit floating point data representation format, i.e., 2^(offset-(X-1-EL)); and

the truncation rounding unit executes the following operation:

y=[x],

where y represents the short-bit floating point data after truncation rounding; x represents the long-bit floating point data before truncation rounding; and [x] represents the number obtained by directly truncating the short-bit floating point data from the raw data x.

From the technical solutions, it may be seen that the seventh aspect and eighth aspect of the disclosure have at least one of the following beneficial effects. (1) The information processing device of the disclosure adopts the data processing unit to perform extraction and computational processing on the key feature included in the data, and generate the multidimensional vector according to the computational processing result, so that the face may be recognized accurately and rapidly. (2) The information processing device adopts the artificial neural network chip, so that the face may be recognized more accurately and rapidly. (3) The artificial neural network chip is powerful in computation and supports offline running of the neural network, and a user terminal/front end may implement face recognition and corresponding control work off line without assistance of any cloud server in computation. When the chip is online and assisted by the cloud server for computation, the computation capability of the chip is more powerful. (4) The input layer and the final output layer of the neural network are designed to implement recognition of a facial emotion. Such a design makes functions of the whole device extensible. That is, structures or definitions of the input and output layers are changed to configure specific functions. Therefore, the device and the method are endowed with high portability, and may be applied to various application scenarios and devices, and design cost is greatly reduced. (5) Adaptive training of the chip endows the chip with relatively high initial accuracy, and data of a user is accumulated for self-learning, so that adaptability to a facial feature of the user may gradually be achieved, and accuracy is kept improved. (6) In the artificial neural network chip, dedicated on-chip caches (i.e., the instruction cache, the input neuron cache, the output neuron cache, and the weight cache), dedicated artificial neural network operational, and memory access instructions are adopted, so that computational and memory access efficiency may effectively be improved. (7) In the artificial neural network chip, multiple groups of weights and input neurons may be concurrently processed by adder tree computation adopted by the operation unit, so that the computational efficiency may be effectively improved. (8) Adoption of the preprocessing unit may make the input data more suitable to be processed by the artificial neural network to remove noise and redundancy of the input data and improve classification and recognition accuracy and the like. (9) Adopting the short-bit floating point data operation unit may effectively reduce a computation overhead and reduce computational time and power consumption.

It should be noted that a deep neural network is a foundation for many present artificial intelligence applications and its breakthrough application to multiple aspects of voice recognition, image processing, data analysis, advertisement recommendation systems, vehicle automatic steering, and the like implements application of the deep neural network to every aspect of life. However, faster development and more intensive application of the deep neural network are kept restricted by huge calculated amount of the deep neural network. When a processor design for accelerating computation of the deep neural network is adopted, the huge calculated amount will inevitably bring a huge energy consumption overhead, which also restricts further intensive application of a processor. For solving the problems of huge calculated amount and excessive computational time consumption of a neural network algorithm, a neural network hardware processor emerges. The processor is designed for a certain configuration or a certain purpose, thereby achieving a relatively high acceleration ratio and relatively low energy consumption. However, the processor is of relatively low extensibility and its structure may not be changed along with a change in a computation requirement. For solving or at least partially alleviating the abovementioned technical problem, the disclosure further provides a computation device and method, which are online configurable neural network operation device and method. The neural network algorithm may be effectively accelerated, and the energy consumption is relatively low. In addition, online configuration may be implemented according to different computation requirements, so that a utilization rate of each component of the processor is increased, an application range of the processor is extended, and relatively high flexibility and certain extensibility are achieved.

A ninth aspect of the disclosure provides a computation device, which may include: a control module; and an operation module which may include multiple operation units. The control module is configured to send an instruction to the multiple operation units and control data transmit between the operation units.

In some examples, each operation unit is configured to receive the instruction and transmit data to be computed or an intermediate result to the other operation units except itself in one or more directions according to the instruction.

In some examples, the direction may include a direction of transmit to the left/right adjacent or nonadjacent operation units, a direction of transmit to the upper/lower adjacent or nonadjacent operation units, and a direction of transmit to diagonally adjacent or nonadjacent operation units.

In some examples, the direction of transmit to the diagonally adjacent or nonadjacent operation units may include a direction of transmit to the left upper diagonally, left lower diagonally, right upper diagonally, and right lower diagonally adjacent or nonadjacent operation units.

In some examples, the computation device may further include a storage module, including a data storage unit and a temporary cache and is configured to store the data to be computed or the intermediate result in the same region or separately.

In some examples, the control module may include: a storage control unit configured to control the storage module to store or read required data; and a computational control unit configured to control computation manners in the operation units and data transmit between the operation units.

In some examples, each operation unit may include multiple input ports, and the multiple input ports include a port configured to receive data transmitted by the storage module and a port configured to receive data transmitted by the other operation units.

In some examples, each operation unit may further include an output port configured to transmit the data back to the storage module or to a specified operation unit.

In some examples, each operation unit may include at least one multiplier and at least one adder.

In some examples, each operation unit may further include at least one memory.

In some examples, the operation module may include N*N operation units and an ALU, and a data transmit direction between the N*N operation units is an S shape, N being a positive integer.

In some examples, each operation unit in the N*N operation units is configured to receive neuron data and multiply the neuron data and corresponding synaptic weight data in the memory of the operation unit to obtain a product result; each of the second to (N*N)^(th) operation units in the N*N operation units is further configured to receive an computational result transmitted by a respectively previous operation unit and add the computational result and a product result of itself respectively; and the ALU is configured to receive a computational result transmitted by the (N*N)^(th) operation unit and execute activation computation.

In some examples, the operation module may include N*N operation units and N−1 ALUs, and the N*N operation units are configured to transmit computational data in different directions, N being a positive integer.

In some examples, the N*N operation units are arranged in an array with N rows and N columns; the operation units in the first column are configured to receive the data to be computed from the storage module, to complete square operations, and to transmit square values to the right and right diagonally adjacent operation units; the operation units in the first row are configured to receive the data to be computed from the storage module, to complete square operations, and to transmit square values to the right diagonally adjacent operation units; the operation units in the N^(th) column are configured to receive data from the left diagonal and the left operation units and complete accumulation; and the ALU is configured to receive the computational result transmitted by the (N*N)^(th) operation unit and execute an exponential operation.

A tenth aspect of the disclosure provides a computation method, which may include that: a control module sends an instruction; and multiple operation units of an operation module receive the instruction and perform data transmit according to the instruction.

In some examples, each operation unit receives the instruction and transmits data to be computed or an intermediate result to the other operation units except itself in one or more directions according to the instruction.

In some examples, the direction may include a direction of transmit to the left/right adjacent or nonadjacent operation units, a direction of transmit to the upper/lower adjacent or nonadjacent operation units and a direction of transmit to diagonally adjacent or nonadjacent operation units.

In some examples, the direction of transmit to the diagonally adjacent or nonadjacent operation units may include a direction of transmit to the left upper diagonally, left lower diagonally, right upper diagonally and right lower diagonally adjacent or nonadjacent operation units.

In some examples, a storage control unit of the control module controls the storage module to read neuron data to be computed for transmit, reads synaptic weight data and store the synaptic weight data in a memory of each operation unit; and a computational control unit of the control module sends a computational signal to be computed to each operation unit and initializes each operation unit.

In some examples, the storage control unit of the control module sends an instruction, and the storage module transmits the neuron data to be computed to each operation unit; and the computational control unit of the control module sends an instruction, and each operation unit receives the neuron data and multiplies the neuron data and the corresponding synaptic weight data in the memory of itself to obtain a product result.

In some examples, in N*N operation units arranged in an array; the operation unit in the first row and the first column transmits a computational result rightwards to the operation unit in the first row and the second column; the operation unit in the first row and the second column adds the received computational result and a computational product of itself to obtain a partial sum and transmits it rightwards until to the operation unit in the N^(th) row and the N^(th) column; an S-shaped transmit path is formed, and the partial sum is accumulated, N being a positive integer.

In some examples, an ALU in the operation module receives an accumulated result, executes activation computation, and writes an activation computational result back into the storage module.

In some examples, each operation unit receives the computational result of its previous operation unit, adds the computational result and the computational product of itself to obtain a partial sum and continues transmitting the partial sum backwards.

In some examples, the multiple operation units transmit and accumulate the partial sum along the S-shaped path.

In some examples, the ALU of the operation module, after accumulation, receives the computational results of the multiple operation units and executes activation computation.

In some examples, the activation computational result is written into the storage module.

In some examples, during computation for a local response normalization (LRN) layer, the multiple operation units accumulate a square of input data, and the ALU executes an exponential operation on an accumulated result.

In some examples, the operation units of the operation module in the first column receive data to be computed from the storage module, complete square operations and transmit square values to the right and right lower adjacent operation units; the operation units of the operation module in the first row receive the data to be computed from the storage module, complete square operations and transmit square values to the right lower adjacent operation units; and the operation units of the operation module in the N^(th) column receive data from the left upper and the left operation units, and complete accumulation, N being a positive integer.

In some examples, the operation units, except those in the first row, the first column, and the N^(th) column, of the operation module, after receiving the data from the left upper adjacent operation units, transmit the data to the right lower adjacent operation units, and accumulate the data and data transmitted by the left adjacent operation units and transmit accumulated data to the right adjacent operation units.

In some examples, if all accumulation is completed, the operation units of the operation module in the N^(th) column transmit an accumulated result rightwards to the ALU to complete the exponential operation.

From the technical solutions, it may be seen that the ninth aspect and tenth aspect of the disclosure have at least one of the following beneficial effects. (1) According to the online configurable neural network operation device and method of the disclosure, a neural network algorithm may be effectively accelerated, and relatively low energy consumption is achieved. (2) According to the online configurable neural network operation device and method of the disclosure, online configuration may be implemented according to different computation requirements, so that a utilization rate of each component of a processor is increased, an application range of the processor is extended, and relatively high flexibility and certain extensibility are achieved.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structure diagram of a data processing device according to the disclosure;

FIG. 2 is a flowchart of a data processing method according to the disclosure;

FIG. 3 is a structure diagram of a data processing device according to an example of the disclosure;

FIG. 4 is a structure diagram of a task configuration information storage unit according to an example of the disclosure;

FIG. 5 is a flowchart of a data processing method according to an example of the disclosure;

FIG. 6 and FIG. 7 are structure diagrams of a data processing device according to another example of the disclosure;

FIG. 8 is a structure diagram of a data processing device according to another example of the disclosure;

FIG. 9 is a structure diagram of a data cache of a data processing device according to an example of the disclosure;

FIG. 10 is a flowchart of a data processing method according to another example of the disclosure;

FIG. 11 is a structure diagram of a neural network operation unit according to an example of the disclosure;

FIG. 12 is a structure diagram of a neural network operation unit according to another example of the disclosure;

FIG. 13 is a structure diagram of a neural network operation unit according to another example of the disclosure;

FIG. 14 is a flowchart of a data redundancy method according to an example of the disclosure;

FIG. 15 is a structure block diagram of a data redundancy device according to another example of the disclosure;

FIG. 16 is a neural network processor according to an example of the disclosure;

FIG. 17 is a flowchart of a DVFS method according to an example of the disclosure;

FIG. 18 is a flowchart of a DVFS method according to another example of the disclosure;

FIG. 19 is a schematic block diagram of a DVFS method according to an example of the disclosure;

FIG. 20 is a schematic diagram of a DVFS co-processor according to an example of the disclosure;

FIG. 21 is a schematic diagram of a DVFS co-processor according to another example of the disclosure;

FIG. 22 is a functional module diagram of an information processing device according to an example of the disclosure;

FIG. 23 is a schematic diagram of an artificial neural network chip configured as an information processing device according to an example of the disclosure;

FIG. 24 is a schematic diagram of an artificial neural network chip configured as an information processing device according to an example of the disclosure;

FIG. 25 is a schematic diagram of an artificial neural network chip configured as an information processing device according to an example of the disclosure;

FIG. 26 is a schematic diagram of an artificial neural network chip configured as an information processing device according to an example of the disclosure;

FIG. 27 is a schematic diagram of an artificial neural network chip configured as an information processing device according to an example of the disclosure;

FIG. 28 is a functional module diagram of a short-bit floating point data conversion unit according to an example of the disclosure;

FIG. 29 is a functional module diagram of a computation device according to an example of the disclosure;

FIG. 30 is a functional module diagram of a computation device according to an example of the disclosure;

FIG. 31 is a functional module diagram of a computation device according to an example of the disclosure;

FIG. 32 is a functional module diagram of a computation device according to an example of the disclosure; and

FIG. 33 is a schematic diagram of an operation module according to an example of the disclosure.

DETAILED DESCRIPTION OF THE EXAMPLES

The disclosure provides a data processing device which, when task information is configured and input therein, completes interaction with an external device, for example, a processor core, to automatically implement execution of a task of the processor core to implement self-launching.

As illustrated in FIG. 1, the data processing device may include a self-launching task queue device. As illustrated in FIG. 1, the self-launching task queue device may include a task configuration information storage unit and a task queue configuration unit.

The task configuration information storage unit is configured to store configuration information of tasks. The configuration information may include, but is not limited to, a start tag and an end tag of a task, a priority of the task, a launching manner for the task, and the like.

The task queue configuration unit is configured to configure a task queue according to the configuration information of the task configuration information storage unit and complete dynamic task configuration and external communication.

The self-launching task queue device is configured to cooperate with the external device, receive the configuration information sent by the external device and configure the task queue. The external device executes each task according to the configured task queue. Meanwhile, the self-launching task queue device interacts and communicates with the external device.

Referring to FIG. 2, a workflow of the self-launching task queue device is illustrated and, as a data processing method of the disclosure, may include the following steps.

In S201, the external device sends a launching parameter to the self-launching task queue device.

The launching parameter is stored in the task configuration information storage unit of the self-launching task queue device. The launching parameter may include launching information and a launching command. The launching information may be the abovementioned configuration information.

In S202, the task queue configuration unit configures a task queue according to the launching parameter and sends a configured task queue to the external device.

In S203, the external device executes tasks in the task queue and, every time when completing executing a task, sends a first end signal to the task configuration information storage unit.

In S204, the task configuration information storage unit, every time when receiving a first end signal, sends an interrupt signal to the external device, and the external device processes the interrupt signal and sends a second end signal to the task configuration information storage unit.

S203 and S204 are executed for each task in the task queue until all the tasks in the task queue are completed.

The task configuration information storage unit, after receiving the first end signal, may modify the task configuration information stored therein to implement task scheduling.

In order to make the purpose, technical solutions and advantages of the disclosure clearer, the disclosure will further be described below in combination with specific examples and with reference to the drawings in detail.

An example of the disclosure provides a data processing device. As illustrated in FIG. 3, the data processing device may further include a processor core. The processor core cooperates with the self-launching task queue device as the external device.

The configuration information input into the self-launching task queue device may include a launching mode, priority, and the like of the task. The processor core may execute various types of tasks. The tasks may be divided into different task queues, for example, a high-priority queue and a low-priority queue, according to properties of the tasks and an application scenario. The launching mode of the task may include self-launching and common launching.

In the example, referring to FIG. 4, the task configuration information storage unit may include a first storage unit and a second storage unit. The tasks are allocated to the first storage unit or the second storage unit according to the configuration information respectively. The first storage unit stores a high-priority task queue, and the second storage unit stores a low-priority task queue. For the tasks in the task queues, launching and execution of the tasks may be completed according to the respective launching modes.

The above is only exemplary description and not intended to limit the disclosure. In other examples, the task queue may also be configured not according to the priorities but according to other parameters of the tasks, the number of the task queues is also not limited to two and may also be multiple, and correspondingly, there may also be multiple storage units.

Referring to FIG. 5, a workflow of the self-launching task queue device of the abovementioned example is illustrated and, as a data processing method of another example of the disclosure, may include the following steps.

In S501, the processor core sends configuration information of a task queue to the self-launching task queue device.

In S502, the task queue configuration unit configures the task queue according to the configuration information and sends a configured task queue to the processor core.

In the S502, the first storage unit sends a stored high-priority task queue to the processor core and the second storage unit sends a stored low-priority task queue to the processor core.

In S503, the processor core executes tasks in the task queue and, every time when completing executing a task, sends a first end signal to the task configuration information storage unit and task queue configuration is completed.

In S504, the task configuration information storage unit, every time when receiving a first end signal, sends an interrupt signal to the processor core, and the processor core processes the interrupt signal and sends a second end signal to the task configuration information storage unit to complete self-launching of the task queue.

In the disclosure, multiple external devices may be provided, for example, multiple processor cores. The processor cores may be various operation modules, control modules, and the like.

In order to achieve a purpose of brief description, descriptions about technical features, which may be applied in a same manner, of a data processing device according to another example of the disclosure refer to those made in the abovementioned example and the same descriptions are not required to be repeated.

Referring to FIG. 6 and FIG. 7, the processor core of the data processing device may include a control module and a neural network operation module. The neural network operation module may include a control unit, a neural network operation unit, and a storage unit.

The storage unit is configured to store data and instruction for neural network operation. The data may include an input neuron, an output neuron, a weight, a score, an error mode judgment result, and the like. The instruction may include various operation instructions for addition, multiplication, activation, and the like in the neural network operation.

The control unit is configured to control operations of the storage unit and the neural network operation unit.

The neural network operation unit is controlled by the control unit to execute the neural network operation on the data according to an instruction stored in the storage unit.

The control module is configured to provide configuration information of tasks.

Each of the control module and the neural network operation module is equivalent to a processor core. The control module sends configuration information of task queues to the self-launching task queue device. After the self-launching task queue device receives the configuration information, the task queue configuration unit configures the task queues according to the configuration information, stores each task queue in each corresponding storage unit and sends each task queue to the control unit of the neural network operation module. The control unit may monitor a configuration of the self-launching task queue device and configure a neural network operation instruction of the storage unit to a correct position, namely inputting an instruction of an external storage module in the storage unit into an instruction storage module. As illustrated in FIG. 7, the control unit controls the neural network operation unit and the storage unit to execute each task according to the configuration information. The neural network operation unit and the storage unit are required to cooperate to complete a task execution process.

The control unit, every time when completing executing a task, sends a first end signal to the task configuration information storage unit and task queue configuration is completed. The self-launching task queue device, every time when receiving a first end signal of the control unit, modifies the configuration information and sends an interrupt signal to the control unit. The control unit processes the interrupt signal and then sends a second end signal to the self-launching task queue device.

The control unit is usually required to, after being started, send an instruction fetching instruction to complete the operation of configuring the neural network operation instruction of the storage unit to the correct position. That is, the control unit usually may include an instruction fetching instruction cache module. In the disclosure, the control unit is not required to send any instruction fetching instruction. That is, the instruction fetching instruction cache module of the control unit may be eliminated. Therefore, a structure of the device is simplified, cost is reduced and resources are saved.

Referring to FIG. 8, the data processing device of the example may further include a data cache, an instruction cache, and a DMA. The storage unit is connected with the instruction cache and the data cache through the CMA. The instruction cache is connected with the control unit. The data cache is connected with the operation unit.

The storage unit receives input data and transmits neural network operational data and instruction in the input data to the data cache and the instruction cache through the DMA respectively.

The data cache is configured to cache the neural network operational data. More specifically, as illustrated in FIG. 9, the data cache may include an input neuron cache, a weight cache, and an output neuron cache configured to cache input neurons, weights, and output neurons sent by the DMA respectively. The data cache may further include a score cache, error mode judgment result cache, and the like configured to cache scores and error mode judgment results and send the data to the operation unit.

The instruction cache is configured to cache the neural network operation instruction. The instructions for addition, multiplication, activation, and the like of the neural network operation are stored in the instruction cache through the DMA.

The control unit is configured to read the neural network operation instruction from the instruction cache, decode it into an instruction executable for the operation unit and send an executable instruction to the operation unit.

The neural network operation unit is configured to execute corresponding neural network operation on the neural network operational data according to the executable instruction. An intermediate result in a computation process and a final result may be cached in the data cache and are stored in the storage unit through the DMA as output data.

Referring to FIG. 10, a workflow of the self-launching task queue device of the abovementioned example is illustrated and, as a data processing method of another example of the disclosure, may include the following steps.

In S901, the control module sends configuration information of task queues to the self-launching task queue device.

In S902, the task queue configuration unit configures the task queues according to the configuration information and sends configured task queues to the neural network operation module.

After the self-launching task queue device receives the configuration information, the task queue configuration unit configures the task queues according to the configuration information, stores each task queue in each corresponding storage unit thereof and sends each task queue to the control unit of the neural network operation module.

In S903, the control unit monitors a configuration of the self-launching task queue device and controls the neural network operation unit and the storage unit to execute tasks in the task queues according to the configuration information and, every time when completing executing a task, send a first end signal to the task configuration information storage unit and task queue configuration is completed.

In S904, the self-launching task queue device, every time when receiving a first end signal of the control unit, sends an interrupt signal to the control unit, and the control unit processes the interrupt signal and then sends a second end signal to the self-launching task queue device.

The operation in S903 that the control unit controls the neural network operation unit and the storage unit to execute each task according to the configuration information may include the following steps.

The control unit reads a neural network operation instruction from the storage unit according to the configuration information, and the neural network operation instruction is stored in the instruction cache through the DMA.

The control unit reads the neural network operation instruction from the instruction cache, decodes it into an instruction executable for the operation unit and sends an executable instruction to the operation unit.

The neural network operation unit reads neural network operational data from the data cache, executes corresponding neural network operation on the neural network operational data according to the executable instruction and stores a computational result in the data cache and/or the storage unit.

In the example, the neural network operation may include multiplying an input neuron and a weight vector, adding an offset and performing activation to obtain an output neuron. In an implementation, the neural network operation unit may include one or more computational components. The computational components include, but is not limited to, for example, one or more multipliers, one or more adders and one or more activation function units.

The multiplier multiplies input data 1 (in₁) and input data 2 (in₂) to obtain output (out), and a process is: out=in₁*in₂.

As one alternative implementation, the neural network operation unit may include multiple adders and the multiple adders form an adder tree. The adder tree adds the input data (in₁) step by step to obtain output data (out), in₁ being a vector with a length N and N being greater than one, and a process is: out=in₁[1]+in₁[2]+ . . . +in₁[N]; and/or the input data (in₁) is accumulated and then added with the input data (in₂) to obtain the output data (out), and a process is: out=in[1]+in1[2]+ . . . +in₁[N]+in₂; or the input data (in₁) and the input data (in₂) are added to obtain the output data (out), and a process is: out=in₁+in₂.

The activation function unit executes computation on input data (in) through an activation function (active) to obtain activation output data (out), and a process is: out=active(in). The activation function (active) is, but is not limited to, for example, sigmoid, tan h, RELU, and softmax. Besides an activation operation, the activation function unit may further implement other nonlinear computation and may execute computation (f) on the input data (in) to obtain the output data (out), and a process is: out=f(in). The operation unit may also be a pooling unit, and the pooling unit executes pooling computation on the input data (in) to obtain the output data (out) after a pooling operation, and a process is out=pool(in). Pool is the pooling operation; the pooling operation may include, but is not limited to: average pooling, maximum pooling, and median pooling; and the input data in is data in a pooling core related to the output data out.

Correspondingly, the neural network operation may include, but is not limited to, multiplication computation, addition computation, and activation function computation. The multiplication computation refers to multiplying input data 1 and input data 2 to obtain multiplied data. And/or the addition computation is executed to add the input data 1 through the adder tree step by step or accumulate the input data (in_(i)) and then add the input data (in₂) or add the input data 1 and the input data 2 to obtain output data. And/or the activation function computation refers to executing computation on the input data through the activation function (active) to obtain the output data. And/or the pooling computation is out=pool(in). Pool is the pooling operation; the pooling operation may include, but is not limited to: average pooling, maximum pooling, and median pooling; and the input data in is data in the pooling core related to the output data out. The one or more of the abovementioned computations may be freely selected for combination in different sequences, thereby implementing computation of various functions.

In another implementation, the neural network operation unit may include, but is not limited to, multiple PEs and one or more ALUs. Each PE may include a multiplier, an adder, a comparator, and a register/register set. Each PE may receive data from the PEs in each direction, for example, receive data from PEs in a horizontal direction (for example, the right) and/or a vertical direction (for example, the lower), and may also transmit data to the PEs in an opposite horizontal direction (for example, the left) and/or an opposite vertical direction (for example, the upper). And/or each PE may receive data from the PEs in a diagonal direction and may also transmit data to the diagonal PEs in the opposite horizontal direction. Each ALU may complete basic computation such as an activation operation, multiplication, addition, and other nonlinear computation.

Correspondingly, the computation executed by the neural network operation unit may include computation executed by the PEs and computation executed by the ALU. The PE multiplies the input data 1 and the input data 2, adds a product and data stored in the register or the data transmitted by the other PEs, writes a result back into the register or a storage part and simultaneously transmits certain input data or a computational result to the other PEs. And/or the PE accumulates or compares the input data 1 and the input data 2 or the data stored in the register. The ALU completes activation computation or nonlinear computation.

When the neural network operation unit executes convolutional computation, fully connected computation, and the like, for each PE, the input data 1 (in₁) and the input data 2 (in₂) may be multiplied to obtain the multiplied output (out₁), and a process is: out₁=in₁*in₂. The data in the register is extracted and accumulated with a multiplication result (out₁) to obtain a result (out₂): out₂=out₁+data. Out₂ may be written back into the register/register set or the storage part. In addition, certain input data (in₁/in₂) may be transmitted in the horizontal direction or the vertical direction.

When the neural network operation unit processes a vector dot product, for each PE, the input data 1 (in₁) and the input data 2 (in₂) may be multiplied to obtain a multiplied output (out₁), and the process is: out₁=in₁*in₂. The data transmitted by the other PEs is accumulated with the multiplication result (out₁) to obtain the result (out₂): out₂=out₁+data. Then, the computational result (out₂) may be transmitted in the horizontal direction or the vertical direction.

When the neural network operation unit executes pooling computation, for each PE, a multiplication part may not be executed, and the adder or the comparator is directly adopted to complete the pooling computation: out=pool(in). Pool is the pooling operation, and the pooling operation may include, but is not limited to, average pooling, maximum pooling, and median pooling. The input data in is data in the pooling core related to an output out, and intermediate temporary data may be stored in the register.

Each ALU is configured to complete basic computation such as an activation operation, multiplication and addition, or nonlinear computation. The activation operation refers to executing computation on the input data (in) through the activation function (active) to obtain the activation output data (out), and the process is: out=active(in). The activation function may be sigmoid, tan h, RELU, softmax, and the like. The other nonlinear computation refers to executing computation (f) on the input data (in) to obtain the output data (out), and the process is: out=f(in).

In some examples, the neural network operation unit, as illustrated in FIG. 11, may include a primary processing circuit and multiple secondary processing circuits. The operation unit may include a tree module. The tree module may include a root port and multiple branch ports. The root port of the tree module is connected with the primary processing circuit, and each of the multiple branch ports of the tree module is connected with a secondary processing circuit of the multiple secondary processing circuits respectively. The tree module is configured to forward a data block, a weight, and an operation instruction between the primary processing circuit and the multiple secondary processing circuits.

The tree module may be configured as an n-ary tree structure, the structure illustrated in FIG. 11 is a binary tree structure and may also be a ternary tree structure, and n may be an integer greater than or equal to two. A specific value of n is not limited in a specific implementation mode of the application. The layer number may also be two. The secondary processing circuits may be connected to nodes of another layer, except nodes of the last second layer, and, for example, may be connected to nodes of the last layer illustrated in FIG. 11.

In some examples, the neural network operation unit, as illustrated in FIG. 12, may include a primary processing circuit, multiple secondary processing circuits, and a branch processing circuit. The primary processing circuit is specifically configured to allocate a task in the task queue into multiple data blocks and send at least one data block of the multiple data blocks, the weight, and at least one operation instruction of multiple operation instructions to the branch processing circuit.

The branch processing circuit is configured to forward the data block, the weight, and the operation instructions between the primary processing circuit and the multiple secondary processing circuits.

The multiple secondary processing circuits are configured to execute computation on the received data block and the weight according to the operation instruction to obtain intermediate results and to transmit the intermediate results to the branch processing circuit.

The primary processing circuit is configured to perform subsequent processing on the intermediate results sent by the branch processing circuit to obtain a result of the operation instruction, and to send the result of the operation instruction to the control unit.

In some examples, the neural network operation unit, as illustrated in FIG. 13, may include a primary processing circuit and multiple secondary processing circuits. The multiple secondary processing circuits are distributed in an array. Each secondary processing circuit is connected with the other adjacent secondary processing circuits. The primary processing circuit is connected with k secondary processing circuits in the multiple primary processing circuits, and the k secondary processing circuits include n secondary processing circuits in a first row, n secondary processing circuits in an m^(th) row, and m secondary processing circuits in a first column.

The k secondary processing circuits are configured to forward data and instructions between the primary processing circuit and the multiple secondary processing circuits.

The primary processing circuit is configured to allocate a piece of input data into multiple data blocks and to send at least one data block of the multiple data blocks and at least one operation instruction of multiple operation instructions to the k secondary processing circuits.

The k secondary processing circuits are configured to convert the data between the primary processing circuit and the multiple secondary processing circuits.

The multiple secondary processing circuits are configured to execute computation on the received data block according to the operation instruction to obtain intermediate results and to transmit the intermediate results to the k secondary processing circuits.

The primary processing circuit is configured to perform subsequent processing on the intermediate results sent by the k secondary processing circuits to obtain a result of the operation instruction and send the result of the operation instruction to the control unit. The above is only exemplary description and not intended to limit the disclosure. The neural network operation unit may be replaced with a non-neural network operation unit. The non-neural network operation unit is, for example, a universal operation unit. Universal computation may include a corresponding universal operation instruction and data and its computation process is similar to the neural work computation. The universal computation may be, for example, scalar arithmetic computation and scalar logical computation. The universal operation unit may include, but is not limited to, for example, one or more multipliers and one or more adders, and executes basic computation, for example, addition and multiplication.

In some examples, the primary processing circuit is specifically configured to combine and sequence the intermediate results sent by the multiple secondary processing circuits to obtain the result of the operation instruction.

In some examples, the primary processing circuit is specifically configured to combine, sequence, and activate the intermediate results sent by the multiple processing circuits to obtain the result of the operation instruction.

In some examples, the primary processing circuit may include one or any combination of a conversion processing circuit, an activation processing circuit, and an addition processing circuit.

The conversion processing circuit is configured to execute preprocessing on the data, specifically to execute exchange between a first data structure and a second data structure on data or intermediate results received by the primary processing circuit, or to execute exchange between a first data type and a second data type on the data or the intermediate results received by the primary processing circuit.

The activation processing circuit is configured to execute subsequent processing, specifically to execute activation computation on data in the primary processing circuit.

The addition processing circuit is configured to execute subsequent processing, specifically to execute addition computation or accumulation computation.

In some examples, the secondary processing circuit may include a multiplication processing circuit.

The multiplication processing circuit is configured to execute product computation on the received data block to obtain a product result.

In some examples, the secondary processing circuit may further include an accumulation processing circuit. The accumulation processing circuit is configured to execute accumulation computation on the product result to obtain the intermediate result.

In some examples, the tree module is configured as an n-ary tree structure, n being an integer greater than or equal to two.

Another example of the disclosure provides a chip, which may include the data processing device of the abovementioned example.

Another example of the disclosure provides a chip package structure, which may include the chip of the abovementioned example.

Another example of the disclosure provides a board card, which may include the chip package structure of the abovementioned example.

Another example of the disclosure provides an electronic device, which may include the board card of the abovementioned example. The electronic device may include a robot, a computer, a printer, a smayner, a tablet computer, an intelligent terminal, a mobile phone, a drive recorder, a navigator, a sensor, a webcam, a cloud server, a camera, a video camera, a projector, a watch, an earphone, a mobile storage, a wearable device, a transportation means, a household electrical appliance, and/or a medical device.

The transportation means may include an airplane, a ship, and/or a vehicle. The household electrical appliance may include a television, an air conditioner, a microwave oven, a refrigerator, an electric rice cooker, a humidifier, a washing machine, an electric lamp, a gas cooker, and a range hood. The medical device may include a nuclear magnetic resonance spectrometer, a B-ultrasonic smayner, and/or an electrocardiograph.

All of the units and modules in the disclosure may be hardware structures, physical implementation of the hardware structures may include, but is not limited to, physical devices, and the physical devices include, but are not limited to, transistors, memristors, and deoxyribonucleic acid (DNA) computers.

The disclosure provides a data redundancy method. Data is divided into multiple importance ranks, and different data redundancy processing is performed for data of different importance ranks. Therefore, a storage capacity overhead and a memory access power consumption overhead are reduced on the basis of ensuring security and reliability of stored data.

Specifically, FIG. 14 is a flowchart of a data redundancy method. As illustrated in FIG. 14, the data redundancy method specifically may include the following steps.

In S101, data is divided into M importance ranks, M being a positive integer.

Specifically, the importance ranks of the data may be set by comprehensively considering factors such as a size of the data, a magnitude of an absolute value of the data, a type (floating point type and fixed point type) of the data, a read operation frequency of the data, and a write operation frequency of the data.

In S102, important bits of each piece of data in each importance rank are extracted.

Specifically, bits in the data are divided into important bits and unimportant bits. If the data has totally x bits in which y bits are important bits and (x-y) bits are unimportant bits, both of x and y being positive integers and 0≥y<x, only the y important bits of the data are subsequently processed. Positions of the y important bits may be continuous and may also be discontinuous.

In S103, data redundancy processing is performed on the important bits.

Specifically, data redundancy processing may include replica redundancy processing and/or ECC processing. Different processing may be performed according to different importance. For example, when all bits in a piece of data are all important bits, ECC processing may be performed on all the bits of the data. When part of bits in a piece of data are important bits, replica redundancy processing is performed on the important bits of the data.

Replica redundancy may include implementing redundancy backup in the same storage medium and may also implement redundancy backup in different storage media. N data replicas may simultaneously be backed up, where N is a positive integer greater than zero. An ECC manner may include CRC and ECC.

The data redundancy method in the example will be specifically introduced below with some examples.

In some examples of the disclosure, redundancy storage is performed on a control unit, and redundancy storage is not performed on an operation unit. For example, redundancy storage is performed on the neural network instruction; redundancy storage is not performed on the parameter; the neural network instruction is configured as the first importance rank; and the neural network parameter is configured as a second importance rank. The neural network parameter may include topological structure information, neuron data and weight data. Redundancy storage is performed on data of the first importance rank and redundancy storage is not performed on data of the second importance rank. When a read operation is executed on the data of the first importance rank, raw data and two backed-up data replicas are read, in case of corresponding data inconsistency, two replicas of data which are the same are determined as finally read data, and the third replica of data which is inconsistent is simultaneously modified. When a write operation is executed on the data of the first importance rank, the data is simultaneously written back to two backup addresses, and the raw data and the two backed-up data replicas are ensured to be consistent.

As illustrated in FIG. 16, a neural network processor may include a storage unit, a control unit, and an operation unit.

The storage unit is configured to receive external input data, to store a neuron, weight, and an instruction of a neural network, to send the instruction to the control unit, and to send the neuron and the weight to the operation unit.

The control unit is configured to receive the instruction sent by the storage unit and decode the instruction to generate control information to control the operation unit.

The operation unit is configured to receive the weight and the neuron sent by the storage unit, to complete neural network training computation, and to retransmit an output neuron to the storage unit for storage.

The neural network processor may further include an instruction redundancy processing unit. The instruction redundancy processing unit is embedded in the storage unit and the instruction control unit respectively to perform data redundancy processing on the instruction.

In some examples of the disclosure, a topological structure of the operation unit is illustrated in FIG. 11. The operation unit may include a primary processing circuit and multiple secondary processing circuits. The topological structure illustrated in FIG. 11 is a tree module. The tree module may include a root port and multiple branch ports. The root port of the tree module is connected with the primary processing circuit, and each of the multiple branch ports of the tree module is connected with a secondary processing circuit of the multiple secondary processing circuits respectively. The tree module is configured to forward a data block, a weight, and an operation instruction between the primary processing circuit and the multiple secondary processing circuits. As illustrated in FIG. 11, the tree module may include a multilayer node structure, a node is a structure with a forwarding function, and the node may have no computation function.

In some examples of the disclosure, the topological structure of the operation unit is illustrated in FIG. 12. The operation unit may include a primary processing circuit, multiple secondary processing circuits and a branch processing circuit. The primary processing circuit is specifically configured to allocate an input neuron into multiple data blocks and send at least one data block of the multiple data blocks, the weight and at least one operation instruction of multiple operation instructions to the branch processing circuit.

The branch processing circuit is configured to forward the data block, the weight, and the operation instruction between the primary processing circuit and the multiple secondary processing circuits.

The multiple secondary processing circuits are configured to execute computation on the received data block and the weight according to the operation instruction to obtain intermediate results and to transmit the intermediate results to the branch processing circuit.

The primary processing circuit is configured to perform subsequent processing on the intermediate results sent by the branch processing circuit to obtain a result of the operation instruction and to send the result of the operation instruction to the control unit.

In some examples of the disclosure, the topological structure of the operation unit is illustrated in FIG. 13. The operation unit may include a primary processing circuit and multiple secondary processing circuits. The multiple secondary processing circuits are distributed in an array. Each secondary processing circuit is connected with the other adjacent secondary processing circuits. The primary processing circuit is connected with k secondary processing circuits in the multiple primary processing circuits, and the k secondary processing circuits include n secondary processing circuits in a first row, n secondary processing circuits in an m^(th) row, and m secondary processing circuits in a first column.

The k secondary processing circuits are configured to forward data and instructions between the primary processing circuit and the multiple secondary processing circuits.

The primary processing circuit is configured to allocate a piece of input data into multiple data blocks and send at least one data block of the multiple data blocks and at least one operation instruction of multiple operation instructions to the k secondary processing circuits.

The k secondary processing circuits are configured to convert the data between the primary processing circuit and the multiple secondary processing circuits.

The multiple secondary processing circuits are configured to execute computation on the received data block according to the operation instruction to obtain intermediate results and to transmit the intermediate results to the k secondary processing circuits.

The primary processing circuit is configured to perform subsequent processing on the intermediate results sent by the k secondary processing circuits to obtain a result of the operation instruction and send the result of the operation instruction to the control unit. In some examples, the primary processing circuit is specifically configured to combine and sequence the intermediate results sent by the multiple secondary processing circuits to obtain the result of the operation instruction.

In some examples, the primary processing circuit is specifically configured to combine, sequence and activate the intermediate results sent by the multiple processing circuits to obtain the result of the operation instruction.

In some examples, the primary processing circuit may include one or any combination of a conversion processing circuit, an activation processing circuit and an addition processing circuit.

The conversion processing circuit is configured to execute preprocessing on the data, specifically to execute exchange between a first data structure and a second data structure on data or intermediate results received by the primary processing circuit, or to execute exchange between a first data type and a second data type on the data or the intermediate results received by the primary processing circuit.

The activation processing circuit is configured to execute subsequent processing, specifically to execute activation computation on data in the primary processing circuit.

The addition processing circuit is configured to execute subsequent processing, specifically to execute addition computation or accumulation computation.

In some examples, the secondary processing circuit may include a multiplication processing circuit.

The multiplication processing circuit is configured to execute product computation on the received data block to obtain a product result.

In some examples, the secondary processing circuit may further include an accumulation processing circuit. The accumulation processing circuit is configured to execute accumulation computation on the product result to obtain an intermediate result.

In some examples, the tree module is configured as an n-ary tree structure, n being an integer greater than or equal to two.

In some examples, data redundancy is performed on a neural network parameter.

At first, M importance ranks, first, second, . . . , M^(th) importance ranks, are determined for the neural network parameter according to a magnitude of an absolute value of the parameter, and the parameter is correspondingly divided into a corresponding importance rank.

Specifically, M+1 threshold values are set and are recorded as T₀, T₁, T₂, . . . , T_(M) respectively after being sequenced from large to small. When the absolute value D of the neural network parameter meets T_(i-1)>D>T_(i), the data is divided into the i^(th) importance rank, where i=1, 2 . . . , M, T₀, T₁, T₂, . . . T_(M) are all real numbers and T₀>T₁>T₂> . . . >T_(M)≤0. That is, when the absolute value of the neural network parameter meets T₀>D>T₁, the neural network parameter is divided into the first importance rank, when the absolute value of the neural network parameter meets T₁>D>T₂, the neural network parameter is divided into the second importance rank, and so on.

A floating point type parameter in parameters of the i^(th) importance rank has totally x_(i) bits, and it is set that sign bits and first y_(i) bits of an exponential part and a base part are specified as important bits, where both of x_(i) and y_(i) are positive integers, and 0<y_(i)≥x_(i).

A fixed point type parameter in parameters of the i^(th) importance rank has totally x_(i) bits, and it is set that sign bits and first z_(i) bits of a numerical part are specified as important bits, where both of x_(i) and z_(i) are positive integers, and 0<z_(i)≥x_(i).

A data backup manner is adopted for data redundancy of important bits in a parameter of the i^(th) importance rank, two replicas are backed up and redundancy storage is not performed on unimportant bits. When a read operation is executed on the parameter of the i^(th) importance rank, raw data and two backed-up data replicas are simultaneously read for important bits, in case of corresponding data inconsistency, two replicas of data which are the same are determined as finally read data, and the third replica of data which is inconsistent is simultaneously modified. When a write operation is executed on the parameter of the i^(th) importance rank, the important bits are simultaneously written back to two backup addresses, and the data in the raw data and the two backed-up data replicas are ensured to be consistent.

In some examples, data redundancy is performed on a sparse neural network parameter.

In the example, the sparse neural network parameter is divided into two parts, i.e., a nonzero parameter and a nonzero parameter position respectively.

The nonzero parameter position is configured as the first importance rank, all other bits are marked as important bits and a CRC code manner is adopted for redundancy storage. When a read operation is executed, a stored CRC code is read, a CRC code of raw data is calculated, and if the two CRC codes are inconsistent, the data is corrected according to the stored CRC code. When a write operation is executed, both of the raw data and the CRC code are stored.

An importance rank is set for the nonzero parameter of the neural network according to a magnitude of an absolute value of the parameter, and M−1 importance ranks are sequentially set from the second importance rank. M threshold values are set and are recorded as T₁, T₂, . . . T_(M) respectively after being sequenced from large to small. When the absolute value D of the nonzero parameter meets T_(i-1)>D>T_(i), the data is divided into the i^(th) importance rank, where i=2, 3 . . . , M, T₁, T₂, . . . T_(M) are all real numbers and T₁>T₂> . . . >T_(M)≤0. That is, when the absolute value of the nonzero parameter meets T₁>D>T₂, the nonzero parameter is divided into the second importance rank, when the absolute value of the nonzero parameter meets T₂>D>T₃, the nonzero parameter is divided into the third importance rank, and so on.

A floating point type parameter in parameters of the i^(th) importance rank has totally x_(i) bits, and it is set that sign bits and first y_(i) bits of an exponential part and a base part are specified as important bits, where both of and y_(i) are positive integers, and 0<y_(i)≥x_(i).

A fixed point type parameter in parameters of the i^(th) importance rank has totally x_(i) bits, and it is set that sign bits and first z_(i) bits of a numerical part are specified as important bits, where both of x_(i) and z_(i) are positive integers, and 0<z_(i)≥x_(i).

A data backup manner is adopted for data redundancy of important bits in a parameter of the i^(th) importance rank. Two replicas are backed up and redundancy storage is not performed on unimportant bits. When a read operation is executed on the parameter of the i^(th) importance rank, raw data and two backed-up data replicas are simultaneously read for important bits, in case of corresponding data inconsistency, two replicas of data which are the same are determined as finally read data, and the third replica of data which is inconsistent is simultaneously modified. When a write operation is executed on the parameter of the i^(th) importance rank, the important bits are simultaneously written back to two backup addresses, and meanwhile, the data in the raw data and the two backed-up data replicas are ensured to be consistent.

In some examples, redundancy is performed on data in a diagram computation application.

In the example, the data in the diagram computation application is divided into two parts, including vertex data and side data.

The vertex data in the diagram computation application is configured as the first importance rank. All data bits are marked as important bits and a CRC code manner is adopted for redundancy storage. When a read operation is executed, a stored CRC code is read, and a CRC code of raw data is calculated, and if the two CRC codes are inconsistent, the data is corrected according to the stored CRC code. When a write operation is executed, both of the raw data and the CRC code are stored.

An importance rank is set for the side data in the diagram computation application according to an access frequency of the side data, and M−1 importance ranks are sequentially set from the second importance rank, and are recorded as T₁, T₂, . . . T_(M) respectively after being sequenced from large to small. When the access frequency F of the side data meets T_(i-1)>F>T_(i), the data is divided into the i^(th) importance rank, where i=2, 3 . . . , M, T₁, T₂, . . . , T_(M) are all real numbers and T₁>T₂> . . . >T_(M)≤0. That is, when the access frequency of the side data meets T₁>F>T₂, the side data is divided into the second importance rank, when the access frequency of the side data meets T₂>F>T₃, the side data is divided into the third importance rank, and so on.

Floating point type side data in the i^(th) importance rank has totally x_(i) bits, and it is set that sign bits and first y_(i) bits of an exponential part and a base part are specified as important bits, where both of x_(i) and y_(i) are positive integers, and 0<y_(i)≥x_(i).

Fixed point type side data in parameters of the i^(th) importance rank has totally x_(i) bits, and it is set that sign bits and first z_(i) bits of a numerical part are specified as important bits, wherein both of x_(i) and z_(i) are positive integers, and 0<z_(i)≥x_(i).

A data backup manner is adopted for data redundancy of important bits in the side data of the i^(th) importance rank. Two replicas are backed up and redundancy storage is not performed on unimportant bits. When a read operation is executed on the side data of the i^(th) importance rank, raw data and two backed-up data replicas are simultaneously read for important bits, in case of data inconsistency, two replicas of data which are the same are determined as finally read data, and the third replica of data which is inconsistent is simultaneously modified. When a write operation is executed on the side data of the i^(th) importance rank, the important bits are simultaneously written back to two backup addresses, and the data in the raw data and the two backed-up data replicas are ensured to be consistent.

In some examples, a data redundancy device 100 is provided. FIG. 15 is a structure block diagram of a data redundancy device. As illustrated in FIG. 15, the data redundancy device 100 may include an importance rank dividing unit 10, an important bit extraction unit 20, and a data redundancy processing unit 30.

The importance rank dividing unit 10 is configured to divide data into M importance ranks according to importance, M being a positive integer. Specifically, the importance ranks of the data may be set by comprehensively considering factors such as a size of the data, a magnitude of an absolute value of the data, a type (floating point type and fixed point type) of the data, a read operation frequency of the data, and a write operation frequency of the data.

The important bit extraction unit 20 is configured to extract important bits of each piece of data in each importance rank. The important bit extraction unit 20 may recognize data of different importance ranks, divide data bits into important data bits and unimportant data bits and extract important bits of each piece of data of each importance rank.

The data redundancy processing unit 30 is configured to perform data redundancy processing on the important bits.

As illustrated in FIG. 2, the data redundancy processing unit 30 may include a redundancy storage unit 31 and a read/write control unit 32.

The redundancy storage unit 31 may store raw data and perform data redundancy storage on the important bits in the data. Data redundancy may be replica backup or ECC. N replicas may simultaneously be backed up, where N is a positive integer greater than zero. An ECC manner may include, but is not limited to, CRC and ECC. The redundancy storage unit 31 may be a hard disk, a dynamic random access memory (DRAM), a static random access memory (SRAM), an ECC-DRAM, an ECC-SRAM, and a nonvolatile memory.

The read/write control unit 32 may execute a read/write operation on redundant data to ensure data read/write consistency.

The disclosure further provides a DVFS method for a neural network, which may include that: a real-time load and power consumption of a processor are acquired, and a topological structure of the neural network, a scale of the neural network, and an accuracy requirement of the neural network are acquired; and then, a voltage prediction and frequency prediction method is adopted to scale a working voltage and frequency of the processor. Therefore, performance of the processor is reasonably utilized, and power consumption of the processor is reduced.

FIG. 17 is a flowchart of a DVFS method according to an example of the disclosure. FIG. 19 is a schematic block diagram of a DVFS method according to an example of the disclosure.

Referring to FIG. 17 and FIG. 19, the DVFS method provided by the example of the disclosure may include the following steps.

In S1701, a processor load signal and a neural network configuration signal in a present time period T−t˜T are acquired.

In S1702, a voltage and frequency of a processor in a next time period T˜T+t are predicted according to the processor load and the neural network configuration signal in the present time period T−t˜T, where T and t are real numbers greater than zero.

In S1701, the operation that the processor load signal in the present time period T−t˜T is acquired refers to acquiring a workload of the processor in real time. The processor may be a dedicated processor for neural network operation.

In some examples, the processor may include a storage unit and a computation unit and may also include other functional units. The disclosure is not limited thereto. The workload of the processor may include a memory access load of the storage unit and a computation load of the computation unit. Power consumption of the processor may include memory access power consumption of the storage unit and computation power consumption of the computation unit.

In some examples of the disclosure, a topological structure of the computation unit is illustrated in FIG. 11. The computation unit may include a primary processing circuit and multiple secondary processing circuits. The topological structure illustrated in FIG. 11 is a tree module. The tree module may include a root port and multiple branch ports. The root port of the tree module is connected with the primary processing circuit, and each of the multiple branch ports of the tree module is connected with a secondary processing circuit of the multiple secondary processing circuits respectively. The tree module is configured to forward a data block, a weight, and an operation instruction between the primary processing circuit and the multiple secondary processing circuits. As illustrated in FIG. 11, the tree module may include a multilayer node structure, a node is a structure with a forwarding function, and the node may have no computation function.

In some examples of the disclosure, the topological structure of the computation unit is illustrated in FIG. 12. The computation unit may include a primary processing circuit, multiple secondary processing circuits, and a branch processing circuit. The primary processing circuit is specifically configured to allocate an input neuron into multiple data blocks and send at least one data block of the multiple data blocks, the weight and at least one operation instruction of multiple operation instructions to the branch processing circuit.

The branch processing circuit is configured to forward the data block, the weight, and the operation instruction between the primary processing circuit and the multiple secondary processing circuits.

The multiple secondary processing circuits are configured to execute computation on a received data block and the weight according to the operation instruction to obtain intermediate results and to transmit the intermediate results to the branch processing circuit.

The primary processing circuit is configured to perform subsequent processing on the intermediate results sent by the branch processing circuit to obtain a result of the operation instruction and to send the result of the operation instruction to the control unit.

In some examples of the disclosure, the topological structure of the computation unit is illustrated in FIG. 13. The computation unit may include a primary processing circuit and multiple secondary processing circuits. The multiple secondary processing circuits are distributed in an array. Each secondary processing circuit is connected with the other adjacent secondary processing circuits. The primary processing circuit is connected with k secondary processing circuits of the multiple primary processing circuits, and the k secondary processing circuits include n secondary processing circuits in a first row, n secondary processing circuits in an m^(th) row, and m secondary processing circuits in a first column.

The k secondary processing circuits are configured to forward data and instructions between the primary processing circuit and the multiple secondary processing circuits.

The primary processing circuit is configured to allocate a piece of input data into multiple data blocks and to send at least one data block of the multiple data blocks and at least one operation instruction of multiple operation instructions to the k secondary processing circuits.

The k secondary processing circuits are configured to convert the data between the primary processing circuit and the multiple secondary processing circuits.

The multiple secondary processing circuits are configured to execute computation on the received data block according to the operation instruction to obtain intermediate results and to transmit the intermediate results to the k secondary processing circuits.

The primary processing circuit is configured to perform subsequent processing on the intermediate results sent by the k secondary processing circuits to obtain a result of the operation instruction and send the result of the operation instruction to the control unit.

In some examples, the primary processing circuit is specifically configured to combine and sequence the intermediate results sent by the multiple secondary processing circuits to obtain the result of the operation instruction.

In some examples, the primary processing circuit is specifically configured to combine, sequence, and activate the intermediate results sent by the multiple processing circuits to obtain the result of the operation instruction.

In some examples, the primary processing circuit may include one or any combination of a conversion processing circuit, an activation processing circuit, and an addition processing circuit.

The conversion processing circuit is configured to execute preprocessing on the data, specifically to execute exchange between a first data structure and a second data structure on data or intermediate results received by the primary processing circuit, or to execute exchange between a first data type and a second data type on the data or the intermediate results received by the primary processing circuit.

The activation processing circuit is configured to execute subsequent processing, specifically to execute activation computation on data in the primary processing circuit.

The addition processing circuit is configured to execute subsequent processing, specifically to execute addition computation or accumulation computation.

In some examples, the secondary processing circuit may include a multiplication processing circuit.

The multiplication processing circuit is configured to execute product computation on the received data block to obtain a product result.

In some examples, the secondary processing circuit may further include an accumulation processing circuit. The accumulation processing circuit is configured to execute accumulation computation on the product result to obtain the intermediate result.

In some examples, the tree module is configured as an n-ary tree structure, n being an integer greater than or equal to two. In some examples, the neural network configuration signal may include the type of a neural network layer presently processed by the processor, a scale of a parameter of the present layer, and real-time accuracy of the neural network.

In some examples, the frequency in the operation in S1702 that the voltage and the frequency of the processor in the next time period T˜T+t are predicted may include: a frequency of the storage unit and/or the computation unit. Here, a manner of estimation, computation, prediction, induction, and the like may be adopted for prediction, and the prediction manner may be adopted.

In some examples, the operation that the frequency of the computation unit is predicted may include that: m segments of frequency scaling ranges are preset for the computation unit, generating m+1 frequency division points f₀, f₁, . . . , f_(m) in total, where f₀<f₁< . . . <f_(m), f₀, f₁, . . . , f_(m) are real numbers greater than zero and m is a positive integer greater than zero.

In some examples, the operation that the frequency of the storage unit is predicted may include that: m segments of neural network scales, totally m+1 scale division points n₀, n₁, . . . , n_(m), are preset, where n₀<n₁< . . . <n_(m), n₀, n₁, . . . , n_(m) are positive integers greater than zero and m is a positive integer greater than zero.

In some examples, the operation that the frequency of the storage unit is predicted may include that: a frequency scaling range of the computation unit is determined according to a range of a scale n of a present processing layer, and if n_(i-1)<n<n_(i), the frequency scaling range of the computation unit is f_(i-1)<f<f_(i).

In some examples, the operation that the frequency of the storage unit is predicted may include the following steps. The frequency scaling range of the computation unit is further narrowed according to the type of the present processing layer, where layers are divided into two types, that is, a compute-intensive layer and a memory access-intensive layer.

The compute-intensive layer may include a convolutional layer, and the memory access-intensive layer may include a fully connected layer, a pooling layer, and an active layer.

If the layer is a compute-intensive layer, the frequency scaling range of the computation unit is (f_(i-1)+f_(i))/2<f<f_(i).

If the layer is a memory access-intensive layer, the frequency scaling range of the computation unit is f _(i-1)/2<f<(f _(i-1) +f _(i))/2.

In some examples, the operation that the frequency of the storage unit is predicted may include that: fine granularity regulation is performed on the frequency f of the computation unit according to the present accuracy of the neural network.

In some examples, the operation that the frequency of the storage unit is determined may include that: when the present accuracy of the neural network is higher than expected accuracy, the frequency of the computation unit is decreased, and when the present accuracy of the neural network is lower than the expected accuracy, the frequency of the computation unit is increased.

In some examples, the operation that the frequency of the storage unit is determined may include that: k segments of frequency scaling ranges, totally k+1 frequency division points F₀, F₁, . . . , F_(k), are preset for the storage unit, where F₀<F₁< . . . <F_(k), F₀, F₁, . . . , F_(k) are positive integers greater than zero and k is a positive integer greater than zero; and

k segments of neural network scales, totally k+1 scale division points N₀, N₁, . . . , N_(k), are preset, where N₀<N₁< . . . <N_(k), N₀, N₁, . . . , N_(k) are positive integers greater than zero and k is a positive integer greater than zero.

In some examples, the operation that the frequency of the storage unit is determined may include that: a frequency scaling range of the storage unit is determined according to a range of a scale N of a present processing layer, and if N_(i-1)<N<N_(i), the frequency scaling range of the storage unit is F_(i-1)<F<F_(i).

In some examples, the operation that the frequency of the storage unit is predicted may include that: the frequency scaling range of the storage unit is further narrowed according to the type of the present processing layer; if the layer is a compute-intensive layer, the frequency scaling range of the storage unit is F_(i-1)<F<(F_(i-1)+F_(i))/2; and if the layer is a memory access-intensive layer, the frequency scaling range of the storage unit is (F_(i-1)+F_(i))/2<F<F_(i).

In some examples, the operation that the frequency of the storage unit is predicted may include that: fine granularity regulation is performed on the frequency of the storage unit according to the present accuracy of the neural network, and the frequency of the storage unit in the next time period is predicted.

In some examples, the operation that the frequency of the storage unit is determined may include that: when the present accuracy of the neural network is higher than expected accuracy, the memory access frequency of the storage unit is decreased, and when the present accuracy of the neural network is lower than the expected accuracy, the memory access frequency of the storage unit is increased.

The operation in S1702 that the voltage and the frequency of the processor in the next time period T˜T+t are predicted may further include that: a prediction method is adopted to predict the voltage and the frequency of the processor in the next time period. The prediction method may include a preceding value method, a moving average load method, an exponentially weighted average method, and/or a minimum average method.

FIG. 18 is a flowchart of a DVFS method according to another example of the disclosure. In the scaling method of the example, S1801-S1802 are the same as S1701-S1702. The difference is that the method may further include S1803 and S1804.

After the operation that the voltage and the frequency of the processor in the next time period are predicted, the method may further include S1803: a clock setting of a chip is regulated according to the predicted frequency in the next time period to scale the frequency of the processor.

After the operation that the voltage and the frequency of the processor in the next time period are predicted, the method may further include S1804: a power management module of the chip is regulated according to the predicted frequency in the next time period, to scale the voltage supplied to the processor.

FIG. 20 is a schematic diagram of a DVFS co-processor according to an example of the disclosure. According to another aspect of the disclosure, a DVFS co-processor is provided, which may include a signal acquisition unit and a performance prediction unit.

The signal acquisition unit is configured to acquire a workload of a processor, and is further configured to acquire a neural network configuration signal.

The performance prediction unit is configured to receive the neural network configuration signal and predict a frequency and voltage of the processor in a next time period according to a present load and power consumption of the processor.

The signal acquisition unit may acquire a signal related to the load and the power consumption of the processor and the neural network configuration signal, and transmit these signals to the performance prediction unit. The signal acquisition unit may acquire workloads of the computation unit and the storage unit in the neural network processor, and acquire a present layer type and a present layer scale for processing of a neural network and real-time accuracy of the neural network, and transmit these signals to the performance prediction unit.

The performance prediction unit may receive the signals acquired by the signal acquisition unit, predict performance required by the processor in the next time period according to a present system load condition and the neural network configuration signal and output a signal for scaling the frequency and the voltage.

In some examples, the frequency in the operation that the voltage and the frequency of the processor in the next time period are predicted in the performance prediction unit may include: a frequency of the storage unit and/or the computation unit.

As illustrated in FIG. 5, in some examples, the DVFS co-processor may further include a frequency scaling unit configured to receive a frequency signal, determined by the performance prediction unit, of the processor in the next time period and scale the frequency of the storage unit and/or computation unit in the processor.

As illustrated in FIG. 5, in some examples, the DVFS co-processor may further include a voltage scaling unit configured to receive a voltage signal, predicted by the performance prediction unit, of the processor in the next time period and scale a voltage of the storage unit and/or computation unit in the processor.

As illustrated in FIG. 5, the performance prediction unit is connected with the signal acquisition unit, the voltage scaling unit, and the frequency scaling unit. The performance prediction unit receives the type of the layer presently processed by the processor and the scale of the present layer, performs coarse granularity prediction on a frequency range, then finely predicts the voltage and the frequency of the processor according to the present load and power consumption of the processor and the real-time accuracy of the neural network and finally outputs the signal for scaling the frequency and scaling the voltage.

In some examples, the operation that the frequency of the computation unit of the processor in the next time period is predicted in the performance prediction unit may include that: m segments of frequency scaling ranges are preset for the computation unit, generating m+1 frequency division points f₀, f₁, . . . , f_(m) in total, where f₀<f₁< . . . <f_(m), f₀, f₁, . . . , f_(m) are real numbers greater than zero and m is a positive integer greater than zero.

In some examples, the operation that the frequency of the computation unit of the processor in the next time period is predicted in the performance prediction unit may include that: m segments of neural network scales are preset, generating m+1 scale division points n₀, n₁, . . . , n_(m) in total, where n₀<n₁< . . . <n_(m), n₀, n₁, . . . , n_(m) are positive integers greater than zero and m is a positive integer greater than zero.

In some examples, the operation that the frequency of the computation unit of the processor in the next time period is predicted in the performance prediction unit may include that: a frequency scaling range of the computation unit is determined according to a range of a scale n of a present processing layer, and if n_(i-1)<n<n_(i), the frequency scaling range of the computation unit is f_(i-1)<f<f_(i).

In some examples, the operation that the frequency of the computation unit of the processor in the next time period is predicted in the performance prediction unit may include that: the frequency scaling range of the computation unit is further narrowed according to the type of the present processing layer, where layers are divided into two types, including a compute-intensive layer, i.e., a convolutional layer, and a memory access-intensive layer, i.e., a fully connected layer and/or a pooling layer; if the layer is a compute-intensive layer, the frequency scaling range of the computation unit is (f_(i-1)+f_(i))/2<f<f_(i); and if the layer is a memory access-intensive layer, the frequency scaling range of the computation unit is f_(i-1)/2<f<(f_(i-1)+f_(i))/2.

In some examples, the operation that the frequency of the computation unit of the processor in the next time period is predicted in the performance prediction unit may include that: fine granularity regulation is performed on the frequency of the computation unit according to the present accuracy of the neural network.

In some examples, the operation that the frequency of the computation unit of the processor in the next time period is predicted in the performance prediction unit may include that:

when the present accuracy of the neural network is higher than expected accuracy, the frequency of the computation unit is decreased, and

when the present accuracy of the neural network is lower than the expected accuracy, the frequency of the computation unit is increased.

In some examples, the operation that the frequency of the storage unit of the processor in the next time period is predicted in the performance prediction unit may include that: k segments of frequency scaling ranges are preset for the storage unit, generating k+1 frequency division points F₀, F₁, . . . , F_(k) in total, where F₀<F₁< . . . <F_(k), F₀, F₁, . . . , F_(k) are positive integers greater than zero and k is a positive integer greater than zero.

In some examples, the operation that the frequency of the storage unit of the processor in the next time period is predicted in the performance prediction unit may include that: k segments of neural network scales are preset, generating k+1 scale division points N₀, N₁, . . . , N_(k) in total, where N₀<N₁< . . . <N_(k), N₀, N₁, . . . , N_(k) are positive integers greater than zero and k is a positive integer greater than zero.

In some examples, the operation that the frequency of the storage unit of the processor in the next time period is predicted in the performance prediction unit may include that:

a frequency scaling range of the storage unit is determined according to a range of a scale N of the present processing layer, and if

N_(i-1)<N<N_(i), the frequency scaling range of the storage unit is F_(i-1)<F<F_(i).

In some examples, the operation that the frequency of the storage unit of the processor in the next time period is predicted in the performance prediction unit may include that:

the frequency scaling range of the storage unit is further narrowed according to the type of the present processing layer; if the layer is a compute-intensive layer, the frequency scaling range of the storage unit is F_(i-1)<F<(F_(i-1)+F_(i))/2; and if the layer is a memory access-intensive layer, the frequency scaling range of the storage unit is (F_(i-1)+F_(i))/2<F<F_(i).

In some examples, the operation that the frequency of the storage unit of the processor in the next time period is predicted in the performance prediction unit may include that:

fine granularity regulation is performed on the frequency of the storage unit according to a present utilization rate and power consumption of the processor and the present accuracy of the neural network.

In some examples, the operation that the neural network configuration signal is acquired in the signal acquisition unit may include that: the present layer type and the present layer scale for processing of the neural network and the real-time accuracy of the neural network are acquired.

As illustrated in FIG. 21, in some examples, the performance prediction unit may include at least one of: a preceding value method-based prediction unit, adopting a preceding value method to predict the voltage and the frequency of the processor in the next time period; a moving average load method-based prediction unit, adopting a moving average load method to predict the voltage and the frequency of the processor in the next time period; an exponentially weighted average method-based prediction unit, adopting an exponentially weighted average method to predict the voltage and the frequency of the processor in the next time period; and a minimum average method-based prediction unit, adopting a minimum average method to predict the voltage and the frequency of the processor in the next time period.

The disclosure provides the DVFS method and DVFS co-processor for the neural network. According to the DVFS method, the real-time load and power consumption of the processor are acquired, and the topological structure of the neural network, the scale of the neural network, and the accuracy requirement of the neural network are acquired; and then, a voltage prediction and frequency prediction method is adopted to scale the working voltage and frequency of the processor. Therefore, performance of the processor is reasonably utilized, and power consumption of the processor is reduced. A DVFS algorithm for the neural network is integrated in the DVFS co-processor, and thus the characteristics of topological structure, network scale, accuracy requirement, and the like of the neural network may be fully mined. The signal acquisition unit acquires a system load signal and a topological structure signal of the neural network, a neural network scale signal, and a neural network accuracy signal in real time; the performance prediction unit predicts the voltage and the frequency required by the system; the frequency scaling unit scales the working frequency of the neural network processor; and the voltage scaling unit scales the working voltage of the neural network processor. Therefore, the performance of the neural network processor is reasonably utilized, and the power consumption of the neural network processor is effectively reduced.

The disclosure provides an information processing device. FIG. 22 is a functional module diagram of an information processing device according to an example of the disclosure. As illustrated in FIG. 22, the information processing device may include a storage unit and a data processing unit. The storage unit is configured to receive and store input data, an instruction, and output data. The input data may include one or more images. The data processing unit performs extraction and computational processing on a key feature included in the input data and generates a multidimensional vector for each image according to a computational processing result.

The key feature may include a facial action and expression, a key point position, and the like in the image. A specific form is a feature map (FM) in a neural network. The image may include a static picture, pictures forming a video, a video, or the like. The static picture, the pictures forming the video, or the video may include images of one or more parts of a face. The one or more parts of the face include facial muscles, lips, eyes, eyebrows, nose, forehead, ears, and combination thereof of the face.

Each element of the vector represents an emotion on the face, for example, anger, delight, pain, depression, sleepiness, and doubt. The storage unit is further configured to, after tagging an n-dimensional vector, output the n-dimensional vector, namely outputting the n-dimensional vector obtained by computation.

In some examples, the information processing device may further include a conversion module configured to convert the n-dimensional vector into a corresponding output. The output may be a control instruction, data (0, 1 output), a tag (happiness, depression, and the like), or picture output.

The control instruction may be single click, double click, and dragging of a mouse, single touch, multi-touch, and sliding of a touch screen, turning on and turning off of a switch, and a shortcut key.

In some examples, the information processing device is configured for adaptive training.

Correspondingly, the storage unit is configured to input n images, each image including a tag, each image corresponding to a vector (real emotion vector) and n being a positive integer greater than or equal to one.

The data processing unit takes calibrated data as an input, calculates an output emotion vector, i.e., a predicted emotion vector, in a format the same as the input, compares the output emotion vector with the real emotion vector and updates a parameter of the device according to a comparison result.

The emotion vector may include n elements. A value of each element of the emotion vector may include the following conditions.

(1) The value of each element of the emotion vector may be a number between zero and one (representing a probability of appearance of a certain emotion).

(2) The value of each element of the emotion vector may also be any number greater than or equal to zero (representing an intensity of a certain emotion).

(3) A value of only one element of the emotion vector is one and values of the other elements are zero. Under this condition, the emotion vector may only represent a strongest emotion.

Specifically, the predicted emotion vector may be compared with the real emotion vector in manners of calculating a Euclidean distance and calculating an absolute of dot product of the predicted emotion vector and the real emotion vector. For example, n is three; the predicted emotion vector is [a₁,a₂,a₃]; the real emotion vector is [b₁,b₂,b₃]; the Euclidean distance of the two is [(a₁−b₁)²±(a₂−b₂)²+(a₃−b₃)²]^(1/2); and the absolute value of the dot product of the two is |a₁*b₁+a₂*b₂+a₃*b₃|. Those skilled in the art may understand that the comparison manners are not limited to calculating the Euclidean distance and calculating the absolute value of the dot product, and other methods may also be adopted.

In a specific example of the disclosure, as illustrated in FIG. 23, the information processing device is an artificial neural network chip. The operation that the parameter of the device is updated may include that: a parameter (weight, offset, and the like) of the neural network is adaptively updated.

The storage unit of the artificial neural network chip is configured to store the data and the instruction. The data may include an input neuron, an output neuron, a weight, the image, the vector, and the like. The data processing unit of the artificial neural network chip may include an operation unit configured to execute corresponding computation on the data according to an instruction stored in the storage unit. The operation unit may be a scalar computation unit configured to complete a scalar multiplication, a scalar addition, or a scalar multiplication and addition operation, or a vector computation unit configured to complete a vector multiplication, vector addition or vector dot product operation, or a hybrid computation unit configured to complete a matrix multiplication and addition operation, a vector dot product computation, and nonlinear computation, or convolutional computation. The computation executed by the operation unit may include neural network operation.

In some examples, a structure of the operation unit is illustrated in FIG. 11 to 13. A specific connecting relationship refers to the descriptions mentioned above and will not be elaborated herein.

In some examples, the operation unit may include, but is not limited to: a first part including a multiplier, a second part including one or more adders (more specifically, the adders of the second part form an adder tree), a third part including an activation function unit, and/or a fourth part including a vector processing unit. More specifically, the vector processing unit may process vector computation and/or pooling computation. The first part multiplies input data 1 (in₁) and input data 2 (in₂) to obtain a multiplied output (out), and a process is: out=in₁×in₂. The second part adds the input data in₁ through the adders to obtain output data (out). More specifically, when the second part is the adder tree, the input data in₁ is added step by step through the adder tree to obtain the output data (out), in₁ being a vector with a length N and N being greater than one, and a process is: out=in₁[1]+in₁[2]+ . . . +in₁[N]; and/or the input data (in₁) is accumulated through the adder tree and then is added with the input data (in₂) to obtain the output data (out), and a process is: out=in₁[1]+in₁[2]+ . . . +in₁[N]+in₂; or the input data (in₁) and the input data (in₂) are added to obtain the output data (out), and a process is: out=in₁+in₂. The third part executes computation on the input data (in) through an activation function (active) to obtain activation output data (out), and a process is: out=active(in). The activation function may be sigmoid, tan h, RELU, softmax, and the like. Besides an activation operation, the third part may implement another nonlinear function and may execute computation (f) on the input data (in) to obtain the output data (out), and a process is: out=f(in). The vector processing unit executes pooling computation on the input data (in) to obtain output data (out) after a pooling operation, and a process is out=pool(in). Pool is the pooling operation, the pooling operation may include, but is not limited to: average pooling, maximum pooling, and median pooling, and the input data in is data in a pooling core related to an output out.

The operation that the operation unit executes computation may include that: the first part multiplies the input data 1 and the input data 2 to obtain multiplied data; and/or the second part executes addition computation (more specifically, adder tree computation configured to add the input data 1 through the adder tree step by step) or adds the input data 1 and the input data 2 to obtain output data; and/or the third part executes the activation function computation, that is, executes computation on the input data through the activation function (active) to obtain the output data; and/or the fourth part executes the pooling computation, out=pool(in). Pool is the pooling operation, the pooling operation may include, but is not limited to: average pooling, maximum pooling, and median pooling, and the input data in is data in the pooling core related to the output out. The computation of one or more parts of the abovementioned parts may be freely selected for combination in different sequences, thereby implementing computation of various functions.

In a specific example of the disclosure, further referring to FIG. 23, the artificial neural network chip may further include a control unit, an instruction cache unit, a weight cache unit, an input neuron cache unit, an output neuron cache unit, and a DMA.

The control unit is configured to read an instruction from the instruction cache, decode the instruction into an operation unit instruction and input the operation unit instruction to the operation unit.

The instruction cache unit is configured to store the instruction.

The weight cache unit is configured to cache weight data.

The input neuron cache unit is configured to cache an input neuron input to the operation unit.

The output neuron cache unit is configured to cache an output neuron output by the operation unit.

The DMA is configured to read/write data or instructions in the storage unit, the instruction cache, the weight cache, the input neuron cache, and the output neuron cache.

In a specific example of the disclosure, as illustrated in FIG. 24, the artificial neural network chip may further include a conversion unit, connected with the storage unit and configured to receive first output data (data of a final output neuron) and convert the first output data into second output data.

The neural network has a requirement on a format of an input picture, for example, a length, a width, and a color channel. As one alternative implementation, in a specific example of the disclosure, as illustrated in FIG. 25 and FIG. 26, the artificial neural network chip may further include a preprocessing unit configured to preprocess original input data, i.e., one or more images, to obtain image data consistent with an input layer scale of a bottom layer of an artificial neural network adopted by the chip to meet the requirement of a preset parameter and data format of the neural network. Preprocessing may include segmentation, Gaussian filtering, binarization, regularization, normalization, and the like.

The preprocessing unit may exist independently of the chip. That is, the preprocessing unit may be configured as an information processing device including a preprocessing unit and a chip. The preprocessing unit and the chip are configured as described above.

In a specific example of the disclosure, as illustrated in FIG. 27, the operation unit of the chip may adopt a short-bit floating point data module for forward computation, including a floating point data statistical module, a short-bit floating point data conversion unit, and a short-bit floating point data operation module.

The floating point data statistical module is configured to perform statistical analysis on data of each type required by artificial neural network forward computation to obtain an EL.

The short-bit floating point data conversion unit is configured to implement conversion from a long-bit floating point data type to a short-bit floating point data type according to the EL obtained by the floating point data statistical module.

The short-bit floating point data operation module is configured to, after the floating point data conversion units adopts the short-bit floating point data type to represent all inputs, weights, and/or offset data required by the artificial neural network forward computation, execute the artificial neural network forward computation on short-bit floating point data.

As one alternative implementation, the floating point data statistical module is further configured to perform statistical analysis on the data of each type required by the artificial neural network forward computation to obtain exponential offset. The short-bit floating point data conversion unit is configured to implement conversion from the long-bit floating point data type to the short-bit floating point data type according to the exponential offset and the EL obtained by the floating point data statistical module. The exponential offset and the EL are set, so that a representable data range may be extended as much as possible. Therefore, all data of the input neuron and the weight may be included.

More specifically, as illustrated in FIG. 28, the short-bit floating point data conversion unit may include an operation cache unit 31, a data conversion unit 32, and a rounding unit 33.

The operation cache unit adopts a data type with relatively high accuracy to store an intermediate result of the forward computation. This is because addition or multiplication computation may extend the data range during the forward computation. After computation is completed, a rounding operation is executed on data beyond a short-bit floating point accuracy range. Then, the data in a cache region is converted into the short-bit floating point data through the data conversion unit 32.

The rounding unit 33 may complete the rounding operation over the data beyond the short-bit floating point accuracy range. The unit may be a random rounding unit, a rounding-off unit, a rounding-up unit, a rounding-down unit, a truncation rounding unit and the like. Different rounding units may implement different rounding operations over the data beyond the short-bit floating point accuracy range.

The random rounding unit executes the following operation:

$y = \left\{ {\begin{matrix} \left\lfloor x \right\rfloor & {{w.p.\mspace{11mu} 1} - \frac{x - \left\lfloor x \right\rfloor}{ɛ}} \\ {\left\lfloor x \right\rfloor + ɛ} & {w.p.\mspace{11mu}\frac{x - \left\lfloor x \right\rfloor}{ɛ}} \end{matrix},} \right.$

where y represents the short-bit floating point data obtained by random rounding; x represents 32-bit floating point data before random rounding; ε is a minimum positive integer which may be represented by a present short-bit floating point data representation format, i.e., 2^(offset-(X-1-EL)); └x┘ represents a number obtained by directly truncating the short-bit floating point data from raw data x (similar to a rounding-down operation over decimals); and w.p. represents a probability, that is, a probability that the data y obtained by random rounding is └x┘ is

$\;{1 - \frac{x - \left\lfloor x \right\rfloor}{ɛ}}$ and a probability that the data y obtained by random rounding is └x┘++ε is

$\frac{x - \left\lfloor x \right\rfloor}{ɛ}.$

The rounding-off unit executes the following operation:

$y = \left\{ {\begin{matrix} \left\lfloor x \right\rfloor & {{{if}\mspace{14mu}\left\lfloor x \right\rfloor} \leq x \leq {\left\lfloor x \right\rfloor + \frac{ɛ}{2}}} \\ {\left\lfloor x \right\rfloor + ɛ} & {{{{if}\mspace{14mu}\left\lfloor x \right\rfloor} + \frac{ɛ}{2}} \leq x \leq {\left\lfloor x \right\rfloor + ɛ}} \end{matrix},} \right.$

where y represents the short-bit floating point data obtained by rounding-off; x represents the long-bit floating point data before rounding-off; ε is the minimum positive integer which may be represented by the present short-bit floating point data representation format, i.e., 2^(offset-(X-1-EL)); is └x┘ is an integral multiple of ε; and a value of └x┘ is a maximum number less than or equal to x.

The rounding-up unit executes the following operation:

y=┌x┐,

where y represents the short-bit floating point data obtained by rounding-up; x represents the long-bit floating point data before rounding-up; ┌x┐ is the integral multiple of ε; a value of ┌x┐ is a minimum number greater than or equal to x; and ε is the minimum positive integer which may be represented by the present short-bit floating point data representation format, i.e., 2^(offset-(X-1-EL)).

The rounding-down unit executes the following operation:

y=└x┘,

where y represents the short-bit floating point data obtained by rounding-up; x represents the long-bit floating point data before rounding-up; └x┘ is the integral multiple of ε; a value of ┌x┐ is a maximum number less than or equal to x; and ε is the minimum positive integer which may be represented by the present short-bit floating point data representation format, i.e., 2^(offset-(X-1-EL)).

The truncation rounding unit executes the following operation:

y=[x],

where y represents the short-bit floating point data after truncation rounding; x represents the long-bit floating point data before truncation rounding; and [x] represents the number obtained by directly truncating the short-bit floating point data from the raw data x.

In addition, the artificial neural network chip may be applied to a terminal. The terminal may further include an image acquisition device, besides the artificial neural network chip. The image acquisition device may be a webcam and a camera. The terminal may be a desktop computer, smart home, a transportation means, or a portable electronic device. The portable electronic device may be a webcam, a mobile phone, a notebook computer, a tablet computer, a wearable device, and the like. The wearable device may include a smart watch, a smart band, smart clothes, and the like. The artificial neural network chip may also be applied to a cloud (server). Then only one application (APP) is required on a device of a user. The device uploads an acquired image, the information processing device of the disclosure calculates an output, and a user terminal makes a response.

In addition, the disclosure further provides an information processing method, which may include the following steps.

A storage unit receives input data, the input data including one or more images.

A data processing unit extracts and processes a key feature included in the input data and generates a multidimensional vector for each image according to a processing result.

The key feature may include a facial action and expression, a key point position, and the like in the image. A specific form is an FM in a neural network. The image may include a static picture, pictures forming a video, a video, or the like. The static picture, the pictures forming the video, or the video may include images of one or more parts of a face. The one or more parts of the face include facial muscles, lips, eyes, eyebrows, nose, forehead, ears, and combination thereof of the face.

Each element of the multidimensional vector represents an emotion on the face, for example, anger, delight, pain, depression, sleepiness, and doubt. Furthermore, the information processing method may further include that: tagged data (existing image corresponding to the multidimensional vector) is learned; the multidimensional vector is output after the tagged data is learned; and a parameter of the data processing unit is updated.

Furthermore, the information processing method may further include that: the multidimensional vector is converted into a corresponding output. The output may be a control instruction, data (0, 1 output), a tag (happiness, depression, and the like), and picture output.

The control instruction may be single click, double click, and dragging of a mouse, single touch, multi-touch, and sliding of a touch screen, turning on and turning off of a switch, a shortcut key, and the like.

As one alternative implementation, the information processing method may further include that: adaptive training is performed. A specific flow is as follows.

n images are input into the storage unit, each image including a tag, each image corresponding to a vector (real emotion vector) and n being a positive integer greater than or equal to one.

The data processing unit takes calibrated data as an input, calculates an output emotion vector, i.e., a predicted emotion vector, in a format the same as the input, compares the output emotion vector with the real emotion vector and updates a parameter of the device according to a comparison result.

The emotion vector may include n elements. A value of each element of the emotion vector may include the following conditions.

(1) The value of each element of the emotion vector may be a natural number between zero and one (representing a probability of appearance of a certain emotion).

(2) The value of each element of the emotion vector may also be any number greater than or equal to zero (representing an intensity of a certain emotion). For example, a preset expression is [delight, sadness, fear], and a vector corresponding to a reluctant smiling face may be [0.5, 0.2, 0].

(3) A value of only one element of the emotion vector is one and values of the other elements are zero. Under this condition, the emotion vector may only represent a strongest emotion. For example, a preset expression is [delight, sadness, fear], and a vector corresponding to an obvious smiling face may be [1, 0, 0].

The predicted emotion vector may be compared with the real emotion vector in manners of calculating a Euclidean distance, calculating an absolute of dot product of the predicted emotion vector and the real emotion vector, and the like. For example, n is three; the predicted emotion vector is [a₁,a₂,a₃]; the real emotion vector is [b₁,b₂,b₃]; the Euclidean distance of the two is [(a₁−b₁)²+(a₂−b₂)²+(a₃−b₃)²]^(1/2); and the absolute value of the dot product of the two is |a₁*b₁+a₂*b₂+a₃*b₃|. Those skilled in the art may understand that the comparison manners are not limited to calculating the Euclidean distance and calculating the absolute value of the dot product, and other methods may also be adopted.

As one alternative implementation, the information processing device is an artificial neural network chip. The value of each element of the emotion vector may be a number between zero and one (representing the probability of appearance of a certain emotion). Since emotions of a person may be overlaid, there may be multiple nonzero numbers in the emotion vector to express a complicated emotion.

In a specific example of the disclosure, a method by which the artificial neural network chip obtains the emotion vector may include that: each neuron of a final output layer of the neural network corresponds to an element of the emotion vector, and an output neuron value is a number between zero and one and is determined as a probability of appearance of the corresponding emotion. The whole process for calculating the emotion vector is as follows.

In S1, input data is transmitted into the storage unit through the preprocessing unit or is directly transmitted into the storage unit.

In S2, a DMA transmits the input data in batches to corresponding on-chip caches (i.e., an instruction cache, an input neuron cache, and a weight cache).

In S3, a control unit reads an instruction from the instruction cache and decodes and transmits the instruction into an operation unit.

In S4, the operation unit executes corresponding computation according to the instruction. In each layer of a neural network, computation is implemented mainly in three substeps. In S41, corresponding input neurons and weights are multiplied. In S42, adder tree computation is executed, that is, a result obtained in S41 is added through an adder tree step by step to obtain a weighted sum, and the weighted sum is offset or not processed according to a requirement. In S43, activation function computation is executed on a result obtained in S42 to obtain output neurons, and the output neurons are transmitted into an output neuron cache.

In S5, S2 to S4 are repeated until computation for all the data is completed, namely obtaining a final result required by a function. The final result is obtained by output neurons of the last layer of the neural network. Each neuron of the final output layer of the neural network corresponds to an element of the emotion vector, and an output neuron value is a number between zero and one and is determined as the probability of appearance of the corresponding emotion. The final result is output into the output neuron cache from the operation unit, and then is returned to the storage unit through the DMA.

According to the requirement of the function: a magnitude of the emotion vector (i.e., expression type, which is also the number of the neurons of the final output layer of the artificial neural network), a comparison form (the Euclidean distance, the dot product, and the like) with the real emotion vector of the training data, and a network parameter updating manner (stochastic gradient descent, Adam algorithm, and the like) are required to be preset in an adaptive training stage.

In some examples, a value of only one element of the emotion vector is one and values of the other elements are zero. Under this condition, the emotion vector may only represent the strongest emotion.

In a specific example of the disclosure, the method by which the artificial neural network chip obtains the emotion vector may include that: each neuron of the final output layer of the neural network corresponds to an element of the emotion vector, but only one output neuron is one and the other output neurons are zero. The whole process for calculating the emotion vector is as follows.

In S1, input data is transmitted into the storage unit through the preprocessing unit or is directly transmitted into the storage unit.

In S2, the DMA transmits the input data in batches to the instruction cache, the input neuron cache, and the weight cache.

In S3, the control unit reads the instruction from the instruction cache and decodes and transmits the instruction into the operation unit.

In S4, the operation unit executes corresponding computation according to the instruction. In each layer of the neural network, computation is implemented mainly in three substeps. In S41, corresponding input neurons and weights are multiplied. In S42, adder tree computation is executed, that is, a result obtained in S41 is added through an adder tree step by step to obtain a weighted sum, and the weighted sum is offset or not processed according to a requirement. In S43, activation function computation is executed on a result obtained in S42 to obtain output neurons, and the output neurons are transmitted into an output neuron cache.

In S5, S2 to S4 are repeated until computation for all the data is completed, namely obtaining a final result required by a function. The final result is obtained by the output neurons of the last layer of the neural network. Each neuron of the final output layer of the neural network corresponds to an element of the emotion vector, but only one output neuron is one and the other output neurons are zero. The final result is output into the output neuron cache from the operation unit, and then is returned to the storage unit through the DMA.

According to the requirement of the function: a magnitude of the emotion vector (i.e., expression type, which is also the number of the neurons of the final output layer of the artificial neural network), a comparison form (the Euclidean distance, the dot product, and the like) with the real emotion vector of the training data and a network parameter updating manner (stochastic gradient descent, Adam algorithm, and the like) are required to be preset in an adaptive training stage. In addition, the real emotion vector used for training in this example is different from example 1 and should also be an “indication” vector like [1,0,0,0, . . . ].

Each functional unit/module in the disclosure may be hardware. For example, the hardware may be a circuit, including a digital circuit, an analogue circuit, and the like. Physical implementation of a hardware structure may include, but is not limited to, a physical device, and the physical device may include, but is not limited to, a transistor, a memristor, and the like. The computation module in the computation device may be any proper hardware processor, for example, a CPU, a graphics processing unit (GPU), a field-programmable gate array (FPGA), a digital signal processor (DSP), and an application specific integrated circuit (ASIC). The storage unit may be any proper magnetic storage medium or magneto-optical storage medium, for example, a resistance random access memory (RRAM), a DRAM, an SRAM, an embedded DRAM (EDRAM), a high bandwidth memory (HBM), and a hybrid memory cube (HMC).

In addition, the neural network of the disclosure may be a convolutional neural network and may also be a fully connected neural network, a restricted Boltzmann machine (RBM) neural network, a recurrent neural network (RNN), and the like. In some other examples, computation may be other operations in the neural network besides convolutional computation, for example, fully connected computation.

Direction terms, for example, “upper”, “lower”, “front”, “back”, “left” and “right”, mentioned in the following examples are only directions with reference to the drawings. Therefore, the direction terms are adopted to not limit but describe the disclosure.

An example of the disclosure provides an online configurable neural network operation device, i.e., an online configurable neural network hardware processor. FIG. 29 is a functional module diagram of a computation device according to an example of the disclosure. As illustrated in FIG. 29, the neural network operation device of the disclosure may include a control module and an operation module, and may further include a storage module.

The operation module may include multiple operation units. Each operation unit may include at least one multiplier and at least one adder. In some examples, each operation unit may further include at least one memory. The memory may include a storage space and/or a temporary cache. The storage space is, for example, an SRAM. The temporary cache is, for example, a register.

The control module is configured to send an instruction to the multiple operation units and control data transmit between the operation units.

The instruction may be configured for each operation unit to transmit data to be computed or an intermediate result value to one or more other operation units in one or more directions. The transmit directions include transmit to the left/right adjacent or nonadjacent operation units, transmit to the upper/lower adjacent or nonadjacent operation units, transmit to the diagonally adjacent or nonadjacent operation units, and transmit to multiple adjacent or nonadjacent operation units in multiple directions. The direction of transmit to the diagonally adjacent or nonadjacent operation units may include a direction of transmit to the left upper diagonally, left lower diagonally, right upper diagonally, and right lower diagonally adjacent or nonadjacent operation units.

Each operation unit is provided with multiple input ports. The multiple input ports include a port connected with the storage module and configured to receive data transmitted by the storage module and a port connected with the other operation units and configured to receive data transmitted by the operation units. Each operation unit is also provided with an output port configured to transmit the data back to the storage module or to a specified operation unit.

The storage module may include a data storage unit and/or a temporary cache. According to a requirement, one or more data storage units and/or temporary caches may be provided. That is, the data to be computed may be stored in the same region and may also be stored separately. An intermediate result may be stored in the same region and may also be stored separately. The data storage unit is, for example, an SRAM. The temporary cache is, for example, a register.

As one alternative example, as illustrated in FIG. 30, the control module may include a storage control unit and a computational control unit. The storage control unit is configured to control the storage module to store or read required data. The computational control unit is configured to control the operation module according to the type of computation to be executed and a computational requirement, including to control specific computation manners in the operation units and to control data transmit between the operation units.

The disclosure further provides a computation method, which may include the following steps.

A control module sends an instruction.

Multiple operation units of an operation module receive the instruction and perform data transmit according to the instruction.

Each operation unit receives the instruction and transmits data to be computed or an intermediate result to the other operation units except itself in one or more directions according to the instruction.

The direction may include a direction of transmit to the left/right adjacent or nonadjacent operation units, a direction of transmit to the upper/lower adjacent or nonadjacent operation units, and a direction of transmit to diagonally adjacent or nonadjacent operation units.

The direction of transmit to the diagonally adjacent or nonadjacent operation units may include a direction of transmit to the left upper diagonally, left lower diagonally, right upper diagonally, and right lower diagonally adjacent or nonadjacent operation units.

In a specific example of the disclosure, the operation module may include N*N (N is a positive integer) operation units and an ALU. The data may be transmitted sequentially in an S-shaped direction, as illustrated in FIG. 31. As one alternative implementation, the ALU is a lightweight ALU. Each operation unit may include a multiplier, an adder, a storage space, and a temporary cache. The intermediate results obtained by every computation executed by the operation units are transmitted between the operation units.

A main computation flow of a processor of the example is as follows. A storage control unit sends a read control signal to a storage module to read neuron data and synaptic weight data to be computed, and store neuron data and synaptic weight data to be computed in the storage spaces of the operation units for transmit respectively. A computational control unit sends a computational signal to be computed to each operation unit and initializes each operation unit, for example, clearing caches. The storage control unit sends an instruction and transmits a neuron to be computed to each operation unit. The computational control unit sends an instruction and each operation unit receives neuron data for multiplication with the corresponding synaptic weight data in its own storage space. A left upper operation unit transmits a computational result rightwards to a second operation unit, and the second operation unit adds the computational result received and a computational product obtained by itself to obtain a partial sum and transmits the partial sum rightwards, and so on. As illustrated in FIG. 31, the partial sum is transmitted according to an S-shaped path and is continuously accumulated. If accumulation is completed, the partial sum is transmitted into the ALU for computation such as activation and then a result is written into the storage module. If not, the result is temporally stored back into the storage module for subsequent scheduling and computation is continued. By such a structure, every time when computation is executed, a characteristic of weight sharing of the neural network is fully utilized, and the weight data is only required to be loaded once at the very beginning, so that the number of memory access times is greatly reduced, and a power consumption overhead is reduced.

In a specific example of the disclosure, as illustrated in FIG. 32, the operation module may include N*N (N is a positive integer) operation units and M−1 ALUs (M is a positive integer). As one alternative implementation, MN. Different operation units may transmit computational data in different directions. That is, there is no such requirement that all the operation units in the same operation module keep a unified transmit direction. Each operation unit may include a multiplier, an adder, and a temporary cache. The intermediate results obtained by every computation executed by the operation units are transmitted between the operation units. As one alternative implementation, the ALUs are lightweight ALUs.

An output value of an LRN layer is (1+(α/n)Σ_(i)x_(i) ²)^(β). When the LRN layer is calculated, accumulation of a square of input data may be completed through the operation units and then a subsequent exponential operation is completed through the ALU. Here, operations and data transmit direction of the operation units are configured as follows. The operation units in the leftmost column are configured to receive data to be computed from the storage module, to complete square operations, and to transmit square values to the right and right lower adjacent operation units. The operation units in the uppermost column are configured to receive the data from the storage module, to complete square operations, and to transmit square values to the right lower adjacent operation units. The operation units in the rightmost column are configured to receive the data from operation units of the left upper and the left, to complete accumulation and, if all accumulation is completed, to transmit the data rightwards to the ALU for subsequent exponential operations according to the instruction. The other operation units are configured to receive the data from the left upper operation units, to transmit the data to the right lower operation units, and to accumulate the data and data transmitted by the left operation units and transmit an accumulated sum rightwards. The rest may be done in the same manner until all computation is completed.

Specific descriptions will be made below with N=3 as an example. As illustrated in FIG. 33, data on the horizontal lines is specific data to be transmitted and data in boxes represent computational results obtained in each operation unit. In this process, related operations may be completed in a pipeline manner. By adopting the processor of the disclosure, data which has been read on the chip may be effectively utilized; the number of memory access times is effectively reduced; a power consumption overhead is reduced; a delay brought by data reading is reduced; and a computational speed is increased.

Each functional unit/module in the disclosure may be hardware. For example, the hardware may be a circuit, including a digital circuit, an analogue circuit, and the like. Physical implementation of a hardware structure may include, but is not limited to, a physical device, and the physical device may include, but is not limited to, a transistor, a memristor, and the like. The computation module in the computation device may be any proper hardware processor, for example, a CPU, a GPU, an FPGA, a DSP, and an ASIC. The storage unit may be any proper magnetic storage medium or magneto-optical storage medium, for example, an RRAM, a DRAM, an SRAM, an EDRAM, an HBM, and an HMC.

In addition, the neural network of the disclosure may be a convolutional neural network and may also be a fully connected neural network, an RBM neural network, an RNN, and the like. In some other examples, computation may be other operations in the neural network besides convolutional computation, for example, fully connected computation.

The processes or methods described in the abovementioned drawings may be executed by processing logics including hardware (for example, a circuit and a dedicated logic), firmware, software (for example, software born on a non-transitory computer-readable medium), or a combination of two. Although the processes or methods have been described above according to some sequential operations, it should be understood that some described operations may be executed in different sequences. In addition, some operations may be executed not sequentially but concurrently.

So far, the examples of the disclosure have been described in combination with the drawings in detail. According to the above descriptions, those skilled in the art should have a clear understanding to the disclosure.

It should be noted that implementations which are not illustrated or described in the drawings or the specification are all forms known to those of ordinary skill in the art and are not described in detail. In addition, the above descriptions about each component are not limited to various specific structures and shapes mentioned in the examples. Those of ordinary skill in the art may make simple modifications or replacements. The disclosure may provide examples of parameters including specific values. However, these parameters are not required to be exactly equal to the corresponding values and, instead, may be approximate to the corresponding values within acceptable error tolerance or design constraints. The examples may be mixed and matched for use or mixed and matched with other examples for use on the basis of considerations about design and reliability. That is, technical features in different examples may be freely combined into more examples.

Purposes, technical solutions and beneficial effects of the disclosure are further described above with the specific examples in detail. It should be understood that the above is only the specific example of the disclosure and not intended to limit the disclosure. Any modifications, equivalent replacements, improvements and the like made within the spirit and principle of the disclosure shall fall within the scope of protection of the disclosure. 

What is claimed is:
 1. A data processing device, comprising: a task configuration information storage unit configured to store configuration information of tasks, wherein the task configuration information storage unit includes multiple storage units configured to store multiple task queues respectively into each of the multiple storage units according to the configuration information; a task queue configuration unit configured to configure a task queue according to the configuration information stored in the task configuration information storage unit, and an external device configured to provide the configuration information and execute the task queue, wherein the external device is configured to send the configuration information to the task configuration information storage unit, wherein the task queue configuration unit is configured to send tasks sequentially to the external device according to priority information in the configuration information, and the external device is configured to execute the tasks in the task queue, and then send a first end signal to the task configuration information storage unit every time a task is executed, wherein the task configuration information storage unit is configured to send an interrupt signal to the external device every time the first end signal is received, and the external device is configured to process the interrupt signal and send a second end signal to the task configuration information storage unit, wherein the task configuration information storage unit is configured to modify the stored task configuration information after receiving the first end signal.
 2. The data processing device of claim 1, wherein the configuration information includes at least one of a start tag of one of the tasks, an end tag of one of the tasks, a priority of one of the tasks, and launching manners for the tasks, a priority of the multiple storage units, or a priority of each task in each of the multiple storage units.
 3. The data processing device of claim 1, wherein the multiple storage units include: a first storage unit associated with a first priority, configured to store a first task queue, and a second storage unit associated with a second priority, configured to store a second task queue, wherein the first priority is higher than the second priority, and a priority of the first task queue is higher than a priority of the second task queue.
 4. The data processing device of claim 2, wherein a task in the task queue of each of the multiple storage units is stored according to the priority of each task in each of the multiple storage units.
 5. The data processing device of claim 1, wherein the external device is further configured to dynamically modify the configuration information of tasks that have not yet been sent to the external device at any time including when the task queue is executed and when the task is finished.
 6. The data processing device claim 1, wherein the external device includes one or more processor cores, wherein the one or more processor cores include a control module configured to provide the configuration information and dynamically modify the configuration information of tasks that have not yet been executed, and further include an operation module configured to execute the task queue, wherein the control module is configured to send the configuration information to the task configuration information storage unit, wherein the operation module includes a control unit, an operation unit, and one of the multiple storage units, the task queue configuration unit is configured to send tasks sequentially to the control unit according to the priority information in the configuration information, and the control unit is configured to monitor the configuration information of a self-launching task queue device, configure operation instructions of the storage unit, control the operation unit and the storage unit to execute tasks in the task queue, and send a first end signal to the task configuration information storage unit every time a task is executed, wherein the task configuration information storage unit is configured to send the interrupt signal to the control unit after receiving one first end signal, and the control unit is configured to process the interrupt signal and send the second end signal to the task configuration information storage unit, wherein the storage unit includes an external storage module and an instruction storage module, and the configuring the operation instructions of the storage unit by the control unit includes: inputting the instructions of the external storage module into the instruction storage module.
 7. The data processing device of claim 6, wherein the storage unit is configured to store data and instructions for a neural network operation, the control unit is configured to control the storage unit and a neural network operation unit to execute the tasks in the task queue, and the operation unit includes the neural network operation unit configured to perform the neural network operation on data according to instructions stored in the storage unit, wherein the storage unit is configured to store data and instructions for a universal operation, the control unit is configured to control the storage unit and a universal operation unit to execute the tasks in the task queue, and the operation unit includes the universal operation unit configured to perform the universal operation on the data according to the instructions stored in the storage unit, wherein the device further includes a data cache, an instruction cache, and a direct memory access (DMA), wherein the data cache is configured to cache data, intermediate results, and operational results, the instruction cache is configured to cache instructions, and the DMA is taken as a data interface between the storage unit and the data cache or a data interface between the storage unit and the instruction cache, wherein the data cache includes an input neuron cache, a weight cache, and an output neuron cache, wherein the input neuron cache is configured to cache input neurons, the weight cache is configured to cache weights, and the output neuron cache is configured to cache output neurons.
 8. The data processing device of claim 7, wherein the neural network operation unit includes at least one computational component, and the computational component includes at least one of multiplier, at least one adder, at least one activation function unit, or at least one pooling unit, wherein the multiple adders form an adder tree.
 9. The data processing device of claim 7, wherein the neural network operation unit includes multiple processing elements (PEs), and one or more arithmetic logic units (ALUs).
 10. A data processing method, comprising: storing, by a task configuration information storage unit, configuration information of tasks, wherein the task configuration information storage unit stores multiple task queues separately into each of storage units of the task configuration information storage unit according to the configuration information; configuring, by a task queue configuration unit, a task queue according to the configuration information stored in the task configuration information storage unit; providing, by an external device, the configuration information; executing, by the external device, the task queue; sending, by the external device, the configuration information to the task configuration information storage unit; sending, by the task queue configuration unit, the tasks sequentially to the external device according to the priority information in the configuration information; executing, by the external device, tasks in the task queue; sending, by the external device, a first end signal to the task configuration information storage unit every time a task is completed; sending by the task configuration information storage unit, an interrupt signal to the external device every time a first end signal is received; processing, by the external device, the interrupt signal and sends a second end signal to the task configuration information storage unit; and modifying, by the task configuration information storage unit, the stored configuration information of a task after receiving the first end signal.
 11. The data processing method of claim 10, wherein the configuration information includes at least one of a start tag of one of the tasks, an end tag of one of the tasks, a priority of one of the tasks, launching manners for the tasks, a priority of the multiple storage units, or a priority of each task in the each of the multiple storage units.
 12. The data processing method of claim 11, wherein the task configuration information storage unit stores the tasks in the task queue according to the priority of each task in the task configuration information storage unit.
 13. The data processing method of claim 10, further comprising: dynamically modifying, by the external device, the configuration information of tasks that have not yet been sent to the external device at any time including the time when the task queue is executed and when the task is finished.
 14. The data processing method claim 10, wherein a first storage unit of the storage unit stores a first task queue, and a second storage unit stores a second task queue, wherein the first task queue includes a high-priority task queue, and the second task queue includes a low-priority task queue.
 15. The data processing method of claim 10, wherein the external device includes one or more processor cores.
 16. The data processing method of claim 15, further comprising: providing, by a control module of the one or more processor cores, the configuration information; dynamically modifying, by the control module, the configuration information of tasks that have not yet been sent to the control module; executing, by an operation module, the task queue sending, by the control module, the configuration information to the task configuration information storage unit; sending, by the task queue configuration unit, a configured task queue to a control unit; monitoring, by the control unit, the configuration information of a self-launching task queue device; configuring, by the control unit, an operation instruction of a storage unit; controlling, by the control unit, an operation unit and the storage unit to execute the tasks in the task queue; sending, by the operation unit, a first end signal to the task configuration information storage unit every time a task is completed; sending, by task configuration information storage unit, an interrupt signal to the control unit every time the first end signal is received; processing, by the control unit, the interrupt signal; and sending, by the control unit, a second end signal to the task configuration information storage unit.
 17. The data processing method of claim 16, further comprising: storing, by the storage unit, data and instructions for a neural network operation, controlling, by the control unit, the storage unit and a neural network operation unit to execute the tasks in the task queue, wherein the operation unit includes the neural network operation unit which performs the neural network operation on data according to instructions stored in the storage unit.
 18. The data processing device of claim 16, further comprising: storing, by the storage unit, data and instructions for a universal operation, controlling, by the control unit, the storage unit and a universal operation unit to execute the tasks in the task queue, wherein the operation unit includes the universal operation unit which performs the universal operation on the data according to the instructions stored in the storage unit.
 19. An electronic device, comprising: a data processing device that includes: a task configuration information storage unit configured to store configuration information of tasks, wherein the task configuration information storage unit includes multiple storage units configured to store multiple task queues respectively into each storage unit according to the configuration information; a task queue configuration unit configured to configure a task queue according to the configuration information stored in the task configuration information storage unit; and an external device configured to provide the configuration information and execute the task queue, wherein the external device is configured to send the configuration information to the task configuration information storage unit, wherein the task queue configuration unit is configured to send tasks sequentially to the external device according to priority information in the configuration information, and the external device is configured to execute the tasks in the task queue, and then send a first end signal to the task configuration information storage unit every time a task is executed, wherein the task configuration information storage unit is configured to send an interrupt signal to the external device every time the first end signal is received, and the external device is configured to process the interrupt signal and send a second end signal to the task configuration information storage unit, wherein the task configuration information storage unit is configured to modify the stored task configuration information after receiving the first end signal. 